WWTP Command Center v10.33

⚙️ Tools & Settings

Quick access to all features

🔍

⚡ QUICK ACCESS

🏭 SETUP & CONFIG

▼

📊 ANALYTICS & REPORTS

▼

⚖️ COMPLIANCE

▼

🔧 OPERATIONS TOOLS

▼

📚 TRAINING & RESOURCES

▼

⚙️ SETTINGS

▼

📊 DASHBOARD

Updated just now

🌤️

72°F

Houston, TX

24hr Precip

0.0"

Humidity

65%

Wind

8 mph

✅ I&I Risk: LOW

No significant rainfall expected

🟢

PLANT STATUS: NORMAL

All systems operating within parameters

Flow

2.4 MGD

2.1 mg/L

7.2

Daily Rounds

2/8

tasks complete

✅

Lab Samples

due today

🧪

Next: Effluent BOD @ 10am

Alerts

all clear

✅

No active warnings

⚡ Quick Launch

📓

Log

🧮

Calcs

📊

Reports

🔧

⚖️

Comply

⚙️

Compliance

95%

0 violations

DMR Due

days left

Jan 21, 2026

Equipment

🟢 Run

🟡 Idle

🔴 Down

Next PM: Jan 15

🧪 EFFLUENT STATUS

BOD

12.5

42%

TSS

15.2

51%

NH₃

1.8

36%

7.2

6.5-8.5

🧪 Chemicals

8 items tracked

⚠️ low stock

📦 Spare Parts

24 items tracked

⚠️ reorder

📝 Quick Notes

E.coli

180

45% of limit

Cl₂

0.8

40% of limit

⚙️ PROCESS HEALTH

✅

MLSS

2,850 mg/L

✅

2.1 mg/L

✅

SVI

125 mL/g

✅

Blanket

1.5 ft

✅

7.2

✅

Temp

72 °F

✅

RAS

50,000 GPD

📈 PROCESS TRENDS (7-day)

MLSS

→ stable

2,850

mg/L

Target: 2,500-3,500 ✓ OK

↑ rising

2.1

mg/L

Target: 2.0-4.0 ✓ OK

→ stable

7.2

units

Target: 6.5-8.5 ✓ OK

FLOW

↓ lower

3.2

MGD

Design: 5.0 MGD 64% cap

🔄 PROCESS FLOW (Extended Aeration)

📋 TODAY'S TASKS

📋

DMR Due

14 days

🔧

Next PM

🧪

Sampling

Tomorrow

📝

Reports

View All

🎯 QUICK ACTIONS

📝 QUICK NOTES

✓ Saved

0 chars | Auto-saves as you type

🔄 REACTORS

📍 Jump to Section (SBR • MBR • MBBR)

⚙️

Master

⏱️

SBR Cycle

💨

SBR Air

⬇️

Settling

🔬

MBR Flux

⚡

MBR Energy

🧫

MBBR

🔗

IFAS

🔄 Advanced Reactor Systems

SBR, MBR, and MBBR calculators and troubleshooting guides

⚙️ Reactor Master Settings

Set master parameters for each reactor type. Values auto-sync to all related calculators.

🔄 SBR Master Parameters

Design Flow (MGD)

Number of Basins

Basin Volume (MG)

Fill Time (min)

React Time (min)

Settle Time (min)

Decant Time (min)

Idle Time (min)

Influent BOD (mg/L)

TKN (mg/L)

Target Eff BOD (mg/L)

Target Eff NH₃ (mg/L)

🔬 MBR Master Parameters

Design Flow (MGD)

Number of Trains

Membrane Area (ft²)

Design Flux (gfd)

TMP Max (psi)

MLSS (mg/L)

Backwash Freq (min)

Backwash Duration (sec)

CIP Interval (days)

Influent BOD (mg/L)

Aeration Basin Vol (MG)

SRT (days)

🧫 MBBR Master Parameters

Design Flow (MGD)

Reactor Volume (MG)

Number of Stages

Media Fill (%)

Media SSA (m²/m³)

Protected Surface (%)

Influent BOD (mg/L)

BOD Loading Rate (g/m²/d)

NH₃ Loading Rate (g/m²/d)

Target DO (mg/L)

Temperature (°C)

Target Eff BOD (mg/L)

🔄 Sequencing Batch Reactor (SBR) Analysis

⏱️ SBR Cycle Time Optimization

Optimize fill, react, settle, decant, and idle phases

Design Flow (MGD)

Number of Basins

Basin Volume (MG)

Fill Time (min)

React Time (min)

Settle Time (min)

Decant Time (min)

Idle Time (min)

💨 SBR Aeration & Oxygen Demand

Calculate oxygen requirements for BOD and nitrogen removal

Influent BOD (mg/L)

Effluent BOD (mg/L)

Flow (MGD)

TKN (mg/L)

Effluent NH3 (mg/L)

React Time (hrs)

⬇️ SBR Settling Performance

Analyze settling characteristics and decant performance

MLSS (mg/L)

SVI (mL/g)

Basin Depth (ft)

Settle Time (min)

Decant Volume (%)

📊 SBR Loading Parameters

Calculate F/M ratio, volumetric loading, and MLSS inventory

Flow (MGD)

Influent BOD (mg/L)

Basin Volume (MG)

MLSS (mg/L)

MLVSS/MLSS Ratio

Number of Basins

🚿 SBR Waste Sludge (WAS)

Calculate waste activated sludge requirements

Target SRT (days)

MLSS (mg/L)

Total Basin Vol (MG)

Effluent TSS (mg/L)

Effluent Flow (MGD)

🌿 SBR Nutrient Removal (BNR)

Evaluate nitrogen and phosphorus removal performance

Influent TN (mg/L)

Effluent TN (mg/L)

Influent TP (mg/L)

Effluent TP (mg/L)

Anoxic Time (min)

Anaerobic Time (min)

🔧 SBR Troubleshooting Guide

Diagnose common SBR operational issues and get recommended solutions

Effluent Quality Issue

Settling Problem

Operational Issue

Current SVI (mL/g)

🔬 Membrane Bioreactor (MBR) Analysis

💧 Membrane Flux & Permeability

Calculate membrane performance and capacity

Permeate Flow (GPM)

Membrane Area (sf)

TMP (psi)

Temperature (°C)

💨 MBR Aeration (Process + Scour)

Calculate process aeration and membrane scour air requirements

BOD Load (lb/day)

TKN Load (lb/day)

Membrane Area (sf)

Scour Rate (SCFM/sf)

⚡ MBR Energy Analysis

Calculate energy consumption and costs

Permeate Pump HP

Blower HP

Hours/Day

Flow (MGD)

Electric Rate ($/kWh)

🧹 MBR Cleaning & Recovery

Track membrane fouling and cleaning effectiveness

Initial Permeability (LMH/bar)

Current Permeability (LMH/bar)

Days Since CIP

Post-CIP Permeability (LMH/bar)

📊 MBR Loading & SRT

Calculate loading rates and solids retention time

Flow (MGD)

Influent BOD (mg/L)

MLSS (mg/L)

Reactor Volume (MG)

WAS Flow (GPD)

WAS Conc (mg/L)

🔧 MBR Troubleshooting Guide

Diagnose common MBR operational issues

TMP Trend

Permeability Trend

Foam Present?

Permeate Quality

🧫 Moving Bed Biofilm Reactor (MBBR) Analysis

🎯 MBBR Media & Surface Area

Calculate effective biofilm surface area and media requirements

Reactor Volume (MG)

Media Fill (%)

Specific Surface Area (m²/m³)

🔬 MBBR BOD Removal Design

Calculate surface area loading rate for BOD removal

Flow (MGD)

Influent BOD (mg/L)

Target Effluent BOD (mg/L)

Temperature (°C)

SALR (g/m²/d)

💨 MBBR Aeration Requirements

Calculate process and mixing air requirements

BOD Load (lb/day)

NH3 Load (lb/day)

Media Volume (cf)

Mixing Air (SCFM/cf media)

🌿 MBBR Nitrification Design

Calculate surface area for ammonia removal

Flow (MGD)

Influent NH3-N (mg/L)

Effluent NH3-N (mg/L)

Temperature (°C)

DO (mg/L)

SANR (g N/m²/d)

🌊 MBBR Hydraulic Design

Verify hydraulic parameters and retention screens

Flow (MGD)

Reactor Volume (MG)

Reactor Length (ft)

Reactor Width (ft)

Water Depth (ft)

Screen Area (sf)

📈 MBBR Performance Monitoring

Track and evaluate MBBR performance

Influent BOD (mg/L)

Effluent BOD (mg/L)

Influent NH3 (mg/L)

Effluent NH3 (mg/L)

Active Surface Area (m²)

Flow (MGD)

🔗 IFAS (Integrated Fixed-Film Activated Sludge)

Calculate combined suspended and attached growth

MLSS (mg/L)

Reactor Volume (MG)

Media Fill (%)

Biofilm Density (g/m²)

Media SSA (m²/m³)

Flow (MGD)

🔧 MBBR Troubleshooting Guide

Diagnose common MBBR/IFAS operational issues and get recommended solutions

Media Issue

Performance Issue

Biofilm Issue

Aeration Issue

📋 COMPLIANCE & LAB

📍 Jump to Section

🎯

All Recs

📈

Benchmark

🔬

Lab Entry

🏛️

Permit

📊

Limits

📝

DMR

⚠️

Risk

📈 Industry Benchmarking GENIUS v9.9.19

COMPOSITE BENCHMARK SCORE

/ 100

🏆 Top 15%

vs. similar facilities

CATEGORY PERFORMANCE

🧪 BOD Removal Efficiency 92%

🔬 TSS Removal Efficiency 88%

⚡ Energy Efficiency 68%

🧫 SRT Management 82%

🌀 Settling Performance 85%

📊 PERFORMANCE RADAR

🏭 INDUSTRY COMPARISON

🏆

Your Plant

Score: 78 | Rank: Top 15%

📊

Industry Average

Score: 65 | Median performer

⭐

Top Performer

Score: 95 | Best in class

📈

Improvement Potential

+17 points to reach top tier

💡 IMPROVEMENT OPPORTUNITIES

⚡ Energy Efficiency +12 pts possible

Optimize DO setpoints and implement load shifting to reach 80th percentile.

🧫 SRT Optimization +5 pts possible

Fine-tune WAS rates to maintain SRT in 8-12 day optimal range for your loading.

🔬 TSS Performance On track

Current performance is strong. Maintain clarifier operations and monitor SVI.

🎯 Comprehensive Recommendations ALL GENIUS SYSTEMS

CRITICAL

Immediate action

HIGH PRIORITY

This week

MEDIUM

This month

TOTAL SAVINGS

$85K

Annual potential

SOURCES

GENIUS systems

📅 30-DAY ACTION PLAN

🚨 WEEK 1: CRITICAL

• Address compliance alerts
• Check equipment warnings
• Review safety issues

⚡ WEEK 2: HIGH PRIORITY

• Optimize DO setpoints
• Schedule PM for Blower #2
• Review chemical dosing

📊 WEEK 3: OPTIMIZATION

• Implement load shifting
• Fine-tune WAS rates
• Update SOP documentation

✅ WEEK 4: VERIFICATION

• Validate improvements
• Update benchmarks
• Prepare monthly report

📋 TCEQ Compliance & Laboratory Module

Permit Tracking, DMR Preparation, Sample Entry & QA/QC

🔬 Laboratory Sample Entry

Sample Date

Sample Location

Sampler

BOD (mg/L)

TSS (mg/L)

NH3-N (mg/L)

TP (mg/L)

DO (mg/L)

🏛️ Permit Information

Permit Number

Facility Name

Permitted Flow (MGD)

Permit Effective Date

Permit Expiration Date

Outfall Number

📊 Effluent Limits & Monitoring

Enter your TPDES permit limits. System will track compliance and alert on exceedances.

Parameter	Daily Max	Weekly Avg	Units	Status
BOD₅			mg/L	✓ OK
TSS			mg/L	✓ OK
NH₃-N			mg/L	✓ OK
E. coli		-	MPN/100mL	✓ OK
DO	mg/L minimum		mg/L	✓ OK
pH	-		S.U.	✓ OK
Total P			mg/L	✓ OK

📝 DMR (Discharge Monitoring Report) Generator

Reporting Period

Month

Year

Daily Monitoring Data Entry

Date	Flow (MGD)	BOD (mg/L)	TSS (mg/L)	NH3 (mg/L)	pH	DO (mg/L)

📅 Compliance Calendar & Deadlines

DMR Due

Jan 25, 2025

Monthly Report

Permit Expires

Dec 31, 2027

Renewal Required

Days Compliant

365

This Year

Violations YTD

Year to Date

Upcoming Deadlines

📋 December DMR Submission Due: Jan 25, 2025

🔬 Quarterly Biomonitoring (WET Test) Due: Jan 31, 2025

📊 Annual Sludge Report Due: Feb 19, 2025

🏛️ Permit Renewal Application Due: Jun 30, 2027

✅ Laboratory QA/QC Status

Duplicates

98.5%

RPD < 20%

Blanks

Pass

All < MDL

Standards

99.2%

Recovery

Hold Times

100%

Compliance

🏭 PLANT PROFILES

🎛️ Master Settings

Plant settings have moved to the Settings panel

Configure flow rates, aeration, clarifiers, disinfection, and more in one place.

📂 Save & Load Plant Profiles

Save plant configurations for different clients. Load a profile to auto-populate all values instantly.

📂 Select Profile

Actions

💾 Save Current Values as New Profile

Profile Name

⚙️ Extended Profile Parameters

Optional details for each plant profile. These are saved with the profile.

Plant Name

Client/Owner

Permit #

Design Flow (MGD)

Process Type

# of Clarifiers

Clarifier Diameter (ft)

SWD (ft)

Target SRT (days)

Notes

📤 Import & Export Profiles

Backup your profiles or transfer them between devices.

💼 BUSINESS

📍 Jump to Section

👥

Clients

📝

Proposals

💵

ROI Calc

🎯

Scenarios

💰

Cost Calc

⏱️

Time Track

💼 Business & Consulting Tools

Client management, proposals, and ROI analysis for your consulting practice

🎯 Scenario Planning Engine NEW v9.9.19

Evaluate strategic capital projects with NPV/ROI analysis. Select scenarios to compare combined impacts.

📊 Scenarios

Available

💰 Best ROI

3.7 yrs

Energy Opt.

📈 Highest NPV

ANNUAL SAVINGS

15 yrs

ROI PERIOD

Timeline: 12-18 months | NPV: $120,000 | Risk: None

🛠️ Custom Scenario Builder CREATE YOUR OWN

🎯

No Custom Scenarios Yet

Create your own scenarios to model capital projects specific to your facility

💰 Operations Cost Calculator

Daily Cost

$0.00

Operating

Monthly Cost

$0.00

30-day avg

Annual Cost

$0.00

Projected

Cost per MG

$0.00

$/MG treated

🏭 Plant Information

Average Daily Flow (MGD)

Operating Days per Year

🧪 Chemical Costs

Chemical	Daily Use (lb)	Daily Cost	Monthly Cost
	-	-	-
	-	-	-
	-	-	-
	-	-	-
	-	-	-
Chemical Subtotal		$0.00	$0.00

⚡ Energy Costs

Electricity Rate ($/kWh)

Demand Charge ($/kW/mo)

Equipment	Daily kWh	Daily Cost	Monthly Cost
	-	-	-
	-	-	-
	-	-	-
	-	-	-
	-	-	-
Energy Subtotal	0	$0.00	$0.00

🚛 Solids Disposal Costs

Sludge Production (dry tons/day)

Disposal Cost ($/wet ton)

Cake Solids (%)

Hauling Cost ($/load)

Tons per Load

Wet Tons per Day	-	wet tons/day
Loads per Month	-	loads
Disposal Cost	-	$/month
Hauling Cost	-	$/month
Solids Subtotal	$0.00	/month

📊 Total Cost Summary

Chemical Costs	$0.00	/month	$0.00	/year
Energy Costs	$0.00	/month	$0.00	/year
Solids Disposal	$0.00	/month	$0.00	/year
TOTAL	$0.00	/month	$0.00	/year
Cost per MG Treated	$0.00/MG

👥 Client & Project Management

Total Clients

Active Projects

Plants Managed

Revenue YTD

➕ Add New Client

Client/Company Name *

Contact Person

Phone

City

Client Type

Notes

📋 Client Database

No clients added yet. Add your first client above!

📁 Projects

No projects yet. Create a project after adding clients.

📝 Proposal Generator

📋 Create New Proposal

Proposal Number

Date

Valid Until

Client Name *

Project Name *

Facility Name

Facility Capacity (MGD)

🔧 Services & Scope

Select services to include in your proposal. Prices are customizable.

Process Assessment & Evaluation

Comprehensive review of treatment processes, performance data, and optimization opportunities

Compliance Review & Support

TCEQ permit review, DMR preparation assistance, compliance strategy development

Operator Training (On-site)

Customized training for plant staff on process control, troubleshooting, and best practices

Energy Optimization Study

Aeration efficiency audit, blower optimization, energy cost reduction strategies

Capacity Analysis & Planning

Current capacity assessment, growth projections, expansion recommendations

Troubleshooting & Problem Resolution

On-site investigation of operational issues, root cause analysis, corrective actions

Monthly Retainer Services

Ongoing support, data review, phone consultations, quarterly site visits

/month

💰 Proposal Summary

Selected Services Subtotal: $0.00

Discount (%)

Travel/Expenses

Total Proposal: $0.00

📂 Saved Proposals

No saved proposals yet.

💵 ROI Calculator

📊 Current vs Proposed Scenario

📍 Current State

Energy Cost ($/month)

Chemical Cost ($/month)

Sludge Disposal ($/month)

Maintenance Cost ($/month)

Labor (hrs/week overtime)

Compliance Fines ($/year)

Current Annual Cost: $0

🎯 After Improvements

Energy Cost ($/month)

Chemical Cost ($/month)

Sludge Disposal ($/month)

Maintenance Cost ($/month)

Labor (hrs/week overtime)

Compliance Fines ($/year)

Proposed Annual Cost: $0

💰 Investment & Payback Analysis

Consulting Fee ($)

Equipment/Capital ($)

Implementation Cost ($)

Labor Rate ($/hr)

📈 ROI Results

Enter current and proposed values, then click "Calculate ROI" to see results.

📊 Savings Breakdown

📄 Client Report

Client Name

Facility Name

Prepared By

⏱️ Time Tracking

⏱️ Active Timer

Client

Project

Task Description

Activity Type

00:00:00

➕ Manual Time Entry

Date

Hours

Billable Rate ($/hr)

Description

📊 Time Log

Total Hours

Billable Hours

Unbilled Amount

Avg Hours/Day

No time entries yet. Start the timer or add manual entries above.

📈 Weekly Summary

Mon

Tue

Wed

Thu

Fri

Sat

Sun

🤖 AI Enhancement

🧠 Intelligent Process Analysis AI Powered

Let AI analyze your plant data and provide optimization recommendations

🔮 AI Insights & Recommendations

Click an analysis type above to generate AI-powered insights based on your current plant data.

💡 Process Optimization 92% Confidence

Based on current F/M ratio and MLSS levels, consider increasing RAS rate by 8-12% to improve settling and reduce SVI.

⚡ Energy Saving Opportunity 87% Confidence

DO levels are consistently above setpoint. Reducing blower output by 15% during 2AM-6AM could save approximately $2,400/month.

⚠️ Predictive Alert 78% Confidence

SVI trend indicates potential filamentous bulking in 7-10 days. Consider implementing chlorination or nutrient adjustment.

🛠️ Quick AI Tools

📝

AI Report Writer

Generate professional reports from your data

🔍

Smart Troubleshooter

Diagnose issues with intelligent questioning

📈

Process Optimizer

Get real-time optimization suggestions

✅

Compliance Advisor

TCEQ regulation guidance and DMR review

💬 AI Assistant Chat

Hello! I'm your WWTP AI assistant. I can help you with process optimization, troubleshooting, compliance questions, and more. What would you like to discuss?

Analyzing...

⚙️ PROCESS CONTROL

📍 Jump to Section

🎯

Optimizer

🧮

Adv Calcs

🎛️

Master Settings

📥

🧫

Sludge

💨

Oxygen

📊

Calcs

🧪

Chemicals

🌊

Hydraulics

📈

SPC Charts

🔬

Lab Calcs

📈

Flow Total

📊

% Removal

💨

Aeration

🎯 Process Optimization Advisor GENIUS v9.9.19

OPTIMIZATION SCORE

/ 100

GOOD

ANNUAL SAVINGS

💰

$48K

potential/year

RECOMMENDATIONS

HIGH

MED

LOW

6 total actions

QUICK WINS

⚡

implement today

📊 ANALYSIS AREAS

💨

Aeration

Analyzing...

$12K/yr

85%

🧫

Solids Mgmt

Analyzing...

$8K/yr

72%

🌿

Nutrient Removal

Analyzing...

$6K/yr

88%

🧪

Chemical Dosing

Analyzing...

$15K/yr

58%

⚡

Energy Efficiency

Analyzing...

$7K/yr

75%

🎯 PRIORITIZED RECOMMENDATIONS

📋 Implementation Progress

0 of 6 completed

Realized Savings: $0 Remaining: $48K

🧮 Advanced Calculator Suite 12 NEW TOOLS

💨

Blower

⚗️

Alkalinity

🌀

SVI

🧪

Chlorine

🔄

Pump

🔀

Flow Split

🧫

Polymer

🫧

Aeration

↩️

Return Rate

⚖️

🚛

Sludge

⚡

Energy

💨 Blower Air Requirement SCFM

Oxygen Demand (lbs O₂/day)

Transfer Efficiency (%)

Safety Factor

Altitude (ft)

Air Required

2,083

SCFM

HP Estimate

Horsepower

⚗️ Alkalinity for Nitrification lbs/day

Flow (MGD)

NH₃-N Removed (mg/L)

Influent Alkalinity (mg/L)

Target Effluent Alk (mg/L)

Alk Consumed

1,840

lbs/day as CaCO₃

Soda Ash Needed

485

lbs/day

🌀 SVI & Settleability Analysis mL/g

30-min Settled Vol (mL/L)

MLSS (mg/L)

SVI

mL/g

SDI

1.20

g/100mL

Status

GOOD

Settling

✓ Normal settling characteristics. Maintain current operations.

🧪 Chlorine Dosing Calculator lbs/day

Flow (MGD)

Target Dose (mg/L)

Solution Strength (%)

Contact Time (min)

Chlorine Required

117

lbs Cl₂/day

Solution Feed Rate

112

GPD

🔄 Pump Flow & Head Calculator GPM/HP

Flow Rate (GPM)

Total Dynamic Head (ft)

Pump Efficiency (%)

Motor Efficiency (%)

Water HP

4.4

Brake HP

6.3

Motor HP

7.5

🔀 Flow Split Calculator % Split

Total Flow (MGD)

# of Trains/Units

Unit 1 Split (%)

Unit 2 Split (%)

Unit 1

2.0

MGD (40%)

Unit 2

1.75

MGD (35%)

Unit 3

1.25

MGD (25%)

🧫 Polymer Dosing Calculator lbs/DT

Sludge Feed Rate (GPM)

Sludge Solids (%)

Polymer Dose (lbs/DT)

Solution Strength (%)

Dry Polymer

lbs/day

Solution Feed

648

GPD

🫧 Aeration Basin Sizing MG

Flow (MGD)

Target HRT (hours)

Side Water Depth (ft)

# of Basins

Total Volume

1.17

Each Basin

0.58

Surface Area

10,400

sq ft each

↩️ RAS/WAS Return Rate %

Influent Flow (MGD)

Target MLSS (mg/L)

RAS Concentration (mg/L)

WAS Rate (GPD)

RAS Ratio

60%

RAS Flow

2.1

MGD

Recycle

1,458

GPM

⚖️ Organic Loading Rates lbs/day

Flow (MGD)

Influent BOD (mg/L)

Influent TSS (mg/L)

Aeration Volume (MG)

BOD Load

5,838

lbs/day

TSS Load

6,422

lbs/day

OLR

lbs BOD/1000 cf

🚛 Sludge Production Estimate lbs/day

Flow (MGD)

TSS Removed (mg/L)

Yield Coefficient

Dewatered Cake (%)

Dry Solids

3,503

lbs/day

Wet Cake

19,461

lbs/day

Weekly Loads

3.4

@ 20 tons

⚡ Energy Cost Calculator $/day

Blower HP

Run Time (hrs/day)

kWh Rate ($/kWh)

Motor Efficiency (%)

Daily kWh

1,656

Daily Cost

$149

Annual Cost

$54K

🔬 Advanced Calculator Suite II 10 NEW TOOLS

🧬

Nutrient

🔥

Digester Gas

📊

BOD/COD

🌊

Hydraulics

🌡️

Temp Corr

🔵

Nitrogen

🟣

Phosphorus

⏱️

Detention

💨

Velocity

⚡

Methane

🧬 Nutrient Removal Efficiency BNR

Influent TN (mg/L)

Effluent TN (mg/L)

Influent TP (mg/L)

Effluent TP (mg/L)

TN Removal

80%

Excellent

TP Removal

89%

Excellent

✓ BNR system operating at optimal efficiency

🔥 Digester Gas Production cf/day

VS Destroyed (lbs/day)

Gas Yield (cf/lb VS)

Methane Content (%)

Engine Efficiency (%)

Total Gas

75,000

cf/day

BTU/day

30.4M

million

Power Gen

130

kW equiv

📊 BOD/COD Ratio Analysis RATIO

Influent BOD₅ (mg/L)

Influent COD (mg/L)

Effluent BOD₅ (mg/L)

Effluent COD (mg/L)

BOD/COD

0.44

Biodegradable

BOD Removal

95%

COD Removal

91%

✓ Typical municipal wastewater - readily biodegradable

🌊 Pipe Hydraulics (Hazen-Williams) ft/s

Flow (GPM)

Pipe Diameter (in)

Pipe Length (ft)

C-Factor

Velocity

5.67

ft/sec

Head Loss

4.82

HL/100ft

0.48

✓ Velocity within acceptable range (2-10 ft/s)

🌡️ Temperature Correction Factors θ

Design Temp (°C)

Operating Temp (°C)

BOD Rate (θ = 1.047)

Nitrif. Rate (θ = 1.098)

BOD Rate @ Temp

0.40

per day

Nitrif. Rate @ Temp

1.22

mg/L/hr

BOD θ Factor

0.79

Nitrif. θ Factor

0.61

🔵 Nitrogen Mass Balance lbs/day

Flow (MGD)

Inf. TKN (mg/L)

Eff. NH₃-N (mg/L)

Eff. NO₃-N (mg/L)

TKN Load In

1,022

lbs/day

N Denitrified

744

lbs/day

Eff. TN

9.5

mg/L

🟣 Chemical Phosphorus Removal Alum/FeCl₃

Flow (MGD)

Inf. TP (mg/L)

Target Eff. TP (mg/L)

Metal:P Ratio

Alum Required

320

lbs/day as Al

Ferric Required

640

lbs/day as Fe

Alum Solution (48%)

65 GPD

Ferric Solution (40%)

128 GPD

⏱️ Detention Time Calculator hrs

Tank Volume (gal)

Flow (MGD)

Tank Depth (ft)

# of Tanks

HRT

3.43

hours

Total Volume

1.0

Surface Area

5,568

sq ft each

💨 Channel/Pipe Velocity ft/s

Flow (MGD)

Channel Width (ft)

Water Depth (ft)

Channel Length (ft)

Velocity

0.67

ft/sec

Cross-Section

sq ft

Contact Time

seconds

✓ Velocity OK for channel flow (min 1.0 ft/s recommended)

⚡ Methane Energy Potential kWh

Biogas (cf/day)

Methane Content (%)

Generator Efficiency (%)

Elec. Rate ($/kWh)

Methane BTU

48.8M

BTU/day

Elec. Potential

5,000

kWh/day

Daily Value

$450

/day

Annual Value: $164,250

🔬 Lab & Process Calculations 8 Calcs + Help

Standard Methods lab calculations with built-in training guides. Click ? on any calculator for regulatory standards, best practices, and troubleshooting.

📊 Total Suspended Solids (TSS)

SM 2540 D - Dried at 103-105°C

Dish + Filter Tare (mg)

Dish + Filter + Residue (mg)

Sample Volume (mL)

TSS Result

-- mg/L

Formula: TSS = ((Final - Tare) × 1,000) / Volume (mL)

💡 Typical Ranges: Influent: 150-350 mg/L | Effluent: 5-30 mg/L | MLSS: 2,000-4,000 mg/L

🔥 Volatile Suspended Solids (VSS)

SM 2540 E - Ignited at 550°C

Dish + Filter + Residue Before Ignition (mg)

Dish + Filter + Residue After Ignition (mg)

Sample Volume (mL)

VSS Result

-- mg/L

Formula: VSS = ((Before Ignition - After Ignition) × 1,000) / Volume

💡 Note: VSS represents the organic (volatile) portion of TSS. MLVSS typically 70-85% of MLSS.

⏱️ Settleable Solids (Imhoff Cone)

SM 2540 F - 1 hour settling in Imhoff cone

30-Minute Settled Volume (mL/L)

60-Minute Settled Volume (mL/L)

Settleable Solids

-- mL/L

Settling Rate

-- %

💡 Typical: Raw Influent: 5-20 mL/L | Primary Effluent: 0.5-3 mL/L | Final Effluent: <0.5 mL/L

📐 Sludge Volume Index (SVI)

30-minute settleometer test

30-Min Settled Volume (mL/L)

MLSS Concentration (mg/L)

Sludge Volume Index

-- mL/g

Enter values to calculate

Formula: SVI = (Settled Volume × 1000) / MLSS

Good
<100 mL/g

Fair
100-200 mL/g

Bulking
>200 mL/g

🔬 Percent Volatile Solids

Ratio of VSS to TSS (organic fraction)

TSS Concentration (mg/L)

VSS Concentration (mg/L)

% Volatile

-- %

% Fixed (Inert)

-- %

💡 Typical: MLVSS/MLSS: 70-85% | Primary Sludge: 60-80% | WAS: 70-80% | Digested: 45-60%

🧫 Biochemical Oxygen Demand (BOD₅)

SM 5210 B - 5-Day BOD Test with Seed Correction

📋 Sample Information

Sample Volume (mL)

BOD Bottle Volume (mL)

Initial DO - Sample (mg/L)

Final DO - Sample (mg/L)

BOD₅ Result

318

mg/L

DO Depletion

5.3

mg/L

Dilution Factor

✓ QC Status: PASS

DO depletion ≥2.0 mg/L ✓ | Final DO ≥1.0 mg/L ✓ | Valid test

📋 Dilution Guide (Recommended Sample Volumes)

Expected BOD	Sample Vol (mL)	Dilution
4-12 mg/L	100-300	1-3×
10-30 mg/L	50-100	3-6×
30-100 mg/L	15-50	6-20×
100-300 mg/L	5-15	20-60×
300-1000 mg/L	1-5	60-300×
>1000 mg/L	0.5-1	300-600×

Formulas:
Unseeded: BOD = (D₁ - D₂) × (Bottle Vol / Sample Vol)
Seeded: BOD = ((D₁ - D₂) - (B₁ - B₂) × f) × (Bottle Vol / Sample Vol)
Where f = Seed in Sample / Seed in Control

📊 % Removal Efficiency

Calculate treatment efficiency for permit compliance

📥 INFLUENT

BOD Concentration (mg/L)

📤 EFFLUENT

BOD Concentration (mg/L)

📋 Permit Limit (Optional)

Enable

Max Effluent (mg/L)

Min % Removal Required

% Removal

92.5%

Mass Removed

185

mg/L

Status

✅ GOOD

Above typical

📊 Typical % Removal Ranges

Excellent

BOD >90% | TSS >90%

Good

BOD 85-90% | TSS 85-90%

Poor

BOD <85% | TSS <85%

📈 Flow Totalization

Calculate daily, monthly, and annual flow totals from instantaneous readings

⚡ Instantaneous Flow Rate

Flow Rate

Units

Hours at this Rate

📅 Projection Settings

Days in Month

Plant Design Capacity (MGD)

Daily Flow

2.50

MGD

Daily Volume

2.50

Monthly Total

75.0

Annual Total

912.5

% of Capacity

50%

Normal

🔄 Quick Conversions (at current daily rate)

GPM: 1,736

CFS: 3.87

m³/day: 9,464

L/sec: 109.6

🎛️ Master Settings

Design Flow

-- MGD

Aeration Vol

-- MG

Clarifier Area

-- sq ft

Target DO

-- mg/L

📥 Influent Loading Parameters

Flow Rate (MGD)

💧

BOD (mg/L)

TSS (mg/L)

TKN (mg/L)

TP (mg/L)

COD (mg/L)

📊 Loading Results & Analysis

Parameter	Value	Unit	7-Day Avg	Trend	Status
BOD Load	-	lb/d	-	-	-
TSS Load	-	lb/d	-	-	-
TKN Load	-	lb/d	-	-	-
TP Load	-	lb/d	-	-	-
COD Load	-	lb/d	-	-	-

Organic Loading Rate

0.42

lb BOD/lb MLVSS/d

Volumetric Loading

58.3

lb BOD/1000 ft³/d

BOD:N:P Ratio

100:20:4

Actual

🧫 Sludge Management

Sludge management parameters for activated sludge process control.

🧫 Activated Sludge Parameters

MLSS (mg/L)

MLVSS (mg/L)

Aeration Volume (MG)

RAS Flow (MGD)

WAS Flow (MGD)

WAS TSS (mg/L)

📊 Sludge Results

Parameter	Value	Unit	Status
F/M Ratio	-	lb BOD/lb MLVSS/d	-
MCRT (Sludge Age)	-	days	-
SVI	-	mL/g	-
MLSS Inventory	-	lbs	-
WAS Solids	-	lbs/day	-
RAS Rate	-	% of Q	-

💨 Oxygen & Aeration

💨 Oxygen Requirements

Current DO (mg/L)

Target DO (mg/L)

Peak Factor

O₂ Required

lb O₂/d

Peak Demand

lb O₂/hr

Airflow

CFM

🧮 Enhanced Calculators Auto-Calculate

F/M Ratio

✓ Optimal

Target: 0.2 - 0.5

SVI

✓ Good Settling

Target: 80 - 150

SRT (Sludge Age)

✓ Optimal

Target: 5 - 15 days

MLSS Inventory

25,000

lbs

✓ Normal

→ Stable

⏱️ Detention Time Calculator Auto

Tank Volume MG

Flow Rate MGD

Detention Time

6.86

hours

HRT = (Volume × 24) / Flow = (1.0 MG × 24) / 3.5 MGD = 6.86 hrs

📐 Surface Overflow Rate Auto

Flow Rate MGD

Clarifier Diameter ft

# Clarifiers

Surface Overflow Rate

348

GPD/sq ft

✓ Good (300-800 typical)

SOR = Flow / Area = 3,500,000 GPD / 10,053 sq ft = 348 GPD/ft²

🌊 Weir Loading Rate Auto

Flow Rate MGD

Weir Length ft

Weir Loading

7,000

GPD/ft

✓ Good (<10,000 typical)

WLR = Flow / Weir Length = 3,500,000 / 500 = 7,000 GPD/ft

💨 Oxygen Requirement Auto

BOD Removed (lb/d)

TKN Oxidized (lb/d)

Oxygen Required

8,320

lb O₂/day

347 lb/hr

O₂ = 1.5×BOD + 4.6×TKN = 1.5×5000 + 4.6×400 = 8,320 lb/d

💰 Chemical Cost Calculator Auto

Flow (MGD)

Dose (mg/L)

Cost ($/lb)

Daily Chemical Cost

$365

per day

$10,950/month • $133,225/year

lbs/d = Flow × Dose × 8.34 = 3.5 × 50 × 8.34 = 1,460 lb/d × $0.25 = $365/d

📅 SRT / Sludge Age Auto

Aeration Vol (MG)

MLSS (mg/L)

WAS Flow (GPD)

WAS TSS (mg/L)

Sludge Retention Time

15.0

days

✓ Good for nitrification

SRT = (Vol × MLSS × 8.34) / (WAS × WAS_TSS × 8.34)

📈 Statistical Process Control (SPC) Charts NEW v9.9.16

Monitor process stability with control charts. UCL/LCL automatically calculated from your data. Out-of-control points trigger alerts.

📊 DO Control Chart

✓ In Control

UCL (+3σ)

3.2

UWL (+2σ)

2.9

CL (Mean)

2.3

LWL (-2σ)

1.7

LCL (-3σ)

1.4

Std Dev (σ)

0.30

Data Points

Out of Control

Cp Index

1.33

Cpk Index

1.21

📝 Add Data Point

Date

Time

Value

Notes (optional)

⚠️ Western Electric Rules (Out-of-Control Detection)

Rule 1: 1 point beyond 3σ (UCL/LCL)

✓ Pass

Rule 2: 2 of 3 points beyond 2σ (same side)

✓ Pass

Rule 3: 4 of 5 points beyond 1σ (same side)

✓ Pass

Rule 4: 8 consecutive points on same side of CL

✓ Pass

💨 Aeration & Energy

Oxygen transfer, blower performance, and energy optimization

💨 Oxygen Transfer Efficiency (OTE)

Calculate actual oxygen transfer rate from standard conditions

SOTR (lb O₂/hr)

Water Temp (°C)

Operating DO (mg/L)

Saturation DO (mg/L)

Alpha Factor

Beta Factor

Theta Correction	-
AOTR	-	lb O₂/hr
Transfer Efficiency	-	%

🌀 Blower Performance

Air Flow Required (SCFM)

Discharge Pressure (psig)

Inlet Temp (°F)

Blower Efficiency (%)

Brake HP	-	HP
Motor HP (w/ SF)	-	HP
Power Draw	-	kW

⚡ Energy Cost Analysis

Blower Power (HP)

Pump Power (HP)

Other Equipment (HP)

Hours/Day Operating

Electricity Rate ($/kWh)

Daily kWh

Monthly Cost

Annual Cost

kWh/MG

🧪 CHEMICAL SYSTEMS

📍 Jump to Calculator

🎯

P Removal

☣️

Chlorine

⏱️

CT Calc

💊

Polymer

⚗️

Alkalinity

🧪

Dechlor

🔶

Coagulant

⚖️

pH Adjust

🌱

Carbon

👃

Odor

🧫

Dilution

📦

Inventory

⚗️ Chemical Systems

Chemical feed optimization, dosing calculations, and disinfection

🎯 Chemical Feed Optimizer

Optimize coagulant/flocculant dosing for phosphorus removal

Flow Rate (MGD)

Influent P (mg/L)

Target P (mg/L)

Chemical Type

Solution Strength (%)

Chemical Cost ($/gal)

Me:P Ratio

Dose (mg/L)

Feed Rate (gpd)

Daily Cost

☣️ Chlorine Disinfection

Flow (MGD)

Target Dose (mg/L)

Solution Strength (%)

Contact Time (min)

Cl₂ Required	-	lb/day
Solution Feed	-	gpd
CT Value	-	mg·min/L

⏱️ CT Disinfection Calculator NEW v9.9.29

Calculate CT (Concentration × Time) for disinfection compliance. CT values based on EPA Guidance Manual.

Chlorine Residual (mg/L)

Contact Time (minutes)

Water Temperature (°C)

Target Pathogen / Log Inactivation

*Cryptosporidium requires UV or ozone; chlorine CT shown for reference only

CT Achieved

15.0

mg·min/L

CT Required

104

mg·min/L

CT Ratio

0.14

achieved/required

Status

❌ FAIL

Increase residual or time

📊 Log Inactivation Achieved (at current CT)

Giardia

0.4

log

Virus

3.8

log

E. coli

5.0+

log

Crypto*

<0.5

log

💡 To Achieve Compliance:

Increase chlorine residual to 1.7 mg/L OR increase contact time to 208 minutes

📋 CT Reference Table (Free Chlorine at 20°C, pH 7)

Pathogen	1-log	2-log	3-log	4-log
Giardia lamblia	35	69	104	138
Viruses	1	2	3	4
E. coli	0.03	0.06	0.09	0.12
Cryptosporidium*	N/A	N/A	N/A	N/A

*Cryptosporidium is resistant to chlorine. Use UV (40 mJ/cm²) or ozone for inactivation.

🧫 Jar Test Optimizer Coagulant & Polymer

Record jar test results to determine optimal chemical doses and costs.

⚙️ Test Setup

Sample Source

Coagulant Type

Coagulant Cost ($/lb)

Polymer Type

Polymer Cost ($/lb)

Plant Flow (MGD)

Initial Turbidity (NTU)

Initial pH

Target Turbidity (NTU)

Jar Volume (mL)

Stock Solution (%) 1% = 10,000 mg/L

Syringe Size

💉 Syringe Dose Calculator

🧪 Jar Test Results (6 Jars)

Enter coagulant dose and results for each jar. Leave unused jars blank.

Jar #	Coag Dose (mg/L)	Polymer (mg/L)	Flash Mix pH	Floc Size (1-5)	Settle Time (min)	Final Turb (NTU)	Final pH
1
2
3
4
5
6

📚 Jar Test Reference Guide

Floc Size Scale:

1 = Pin floc (poor)
2 = Small, slow settling
3 = Medium, good
4 = Large, fast settling
5 = Extra large, excellent

Typical Doses:

Alum: 10-50 mg/L
Ferric: 10-50 mg/L
PAC: 5-30 mg/L
Polymer: 0.5-3 mg/L

Optimal pH Ranges:

Alum: 5.5-7.5
Ferric: 4.0-9.0
PAC: 5.0-8.5
Lime: >10.5

💊 Polymer Dosing

Sludge Flow (gpm)

Sludge Solids (%)

Target Dose (lb/DT)

Polymer Solution (%)

Dry Tons/Day	-	DT/day
Polymer Required	-	lb/day
Solution Feed	-	gpm

⚗️ Alkalinity Adjustment

Flow (MGD)

Current Alk (mg/L as CaCO₃)

Target Alk (mg/L as CaCO₃)

Chemical

Alk Increase Needed	-	mg/L
Chemical Required	-	lb/day
Solution Feed	-	gpd

📦 Chemical Inventory Tracker Track & Alert

Track chemical inventory levels, usage rates, and receive low-stock alerts.

Chemical	Current (gal)	Daily Use	Days Left	Reorder Pt	Status	Actions

⚠️ Low Stock

📦 Total Items

💰 Inventory Value

📅 Avg Days Supply

🔧 MAINTENANCE

Equipment tracking, PM schedules, runtime hours, and calibration management

📍 Jump to Section

🔧

PM Tracker

📐

Calibration

📦

Spare Parts

📝

Work Orders

🔧 Equipment PM Tracker NEW v9.9.16

Track equipment runtime hours, maintenance schedules, and costs. Get alerts before PM is due.

⚠️ Overdue

📅 Due Soon (7d)

✓ Up to Date

💰 YTD Cost

Equipment	Category	Runtime (hrs)	Last PM	Interval	Next Due	Status	Actions

📜 Recent Maintenance History

📋
No maintenance history yet

🔬 Calibration Tracking

Instrument	Location	Last Cal	Due	Status
DO Probe #1	Aeration Basin	2024-11-20	2024-12-20	OK
pH Analyzer	Effluent	2024-11-25	2024-12-25	OK
Flow Meter	Influent	2024-06-01	2024-12-01	Overdue
Turbidity	Effluent	2024-11-01	2024-12-01	Due Soon

🛠️ Work Order Log

WO-2024-142In Progress

Blower #2 bearing replacement

Assigned: John D. | Due: 12/10/2024

WO-2024-143Urgent

UV lamp replacement - Bank A

Assigned: Mike S. | Due: 12/08/2024

📏 Instrument Calibration Tracker NEW v9.9.27

Track instrument calibrations, due dates, and compliance. Get alerts before calibrations expire.

⚠️ Overdue

📅 Due 7 Days

✓ Current

📊 Compliance

94%

Instrument	Location	Last Cal	Next Due	Freq	Status
📡 ONLINE PROCESS ANALYZERS
DO Probe #1 Hach LDO2	Aeration Basin 1	12/01/24	12/15/24	14 days	OVERDUE
DO Probe #2 Hach LDO2	Aeration Basin 2	12/08/24	12/22/24	14 days	OVERDUE
pH Probe - Influent Hach pHD sc	Influent Structure	12/20/24	12/27/24	7 days	DUE TODAY
pH Probe - Effluent Hach pHD sc	Effluent	12/22/24	12/29/24	7 days	DUE SOON
ORP Probe Hach DRD8E	Anoxic Zone	12/15/24	01/15/25	30 days	CURRENT
TSS Analyzer - MLSS Hach Solitax sc	Aeration Basin	12/10/24	01/10/25	30 days	CURRENT
TSS Analyzer - RAS Hach Solitax sc	RAS Line	12/10/24	01/10/25	30 days	CURRENT
Turbidity - Effluent Hach TU5300 sc	Effluent	12/15/24	01/15/25	30 days	CURRENT
Chlorine Analyzer Hach CL17sc	Disinfection	12/10/24	01/10/25	30 days	CURRENT
Ammonia Analyzer Hach Amtax sc	Effluent	12/01/24	01/01/25	30 days	CURRENT
📊 FLOW METERS
Influent Flow Meter Endress+Hauser Promag	Influent	06/15/24	06/15/25	Annual	CURRENT
Effluent Flow Meter Endress+Hauser Promag	Effluent	06/15/24	06/15/25	Annual	CURRENT
RAS Flow Meter Endress+Hauser Promag	RAS Pump Station	06/15/24	06/15/25	Annual	CURRENT
WAS Flow Meter Endress+Hauser Promag	WAS Pump Station	06/15/24	06/15/25	Annual	CURRENT
📏 LEVEL INSTRUMENTS
Wet Well Level Siemens Ultrasonic	Lift Station	09/01/24	03/01/25	6 months	CURRENT
Clarifier Blanket Hach Sludge Blanket	Secondary Clarifier	11/01/24	02/01/25	Quarterly	CURRENT
🔬 BENCHTOP LAB EQUIPMENT
Benchtop pH Meter Hach HQ440d	Laboratory	12/26/24	12/27/24	Daily	DUE TODAY
Benchtop DO Meter YSI ProODO	Laboratory	12/20/24	12/27/24	Weekly	DUE TODAY
Benchtop Conductivity Hach HQ440d	Laboratory	12/01/24	01/01/25	Monthly	CURRENT
Turbidimeter Hach 2100Q	Laboratory	12/15/24	01/15/25	Monthly	CURRENT
Spectrophotometer Hach DR3900	Laboratory	12/01/24	01/01/25	Monthly	CURRENT
Analytical Balance Mettler Toledo	Laboratory	06/01/24	06/01/25	Annual	CURRENT
BOD Incubator Thermo NIST Traceable	Laboratory	12/01/24	01/01/25	Monthly	CURRENT
Oven Thermometer NIST Traceable	Laboratory	12/01/24	01/01/25	Monthly	CURRENT
Pipettes (Set of 4) Eppendorf	Laboratory	06/01/24	06/01/25	Annual	CURRENT
⚠️ SAFETY / CONFINED SPACE
4-Gas Monitor #1 MSA Altair 4XR	Operations	12/20/24	12/30/24	Monthly	DUE SOON
4-Gas Monitor #2 MSA Altair 4XR	Operations	12/20/24	12/30/24	Monthly	DUE SOON
H₂S Area Monitor RKI GD-70D	Headworks	09/01/24	03/01/25	6 months	CURRENT
Chlorine Area Monitor Honeywell Manning	Disinfection Bldg	09/01/24	03/01/25	6 months	CURRENT

📋 Recent Calibration Log

pH Probe #1 calibrated - 2-point (4.0, 7.0) 12/20/24 08:15 - J. Smith

DO Probe #1 calibrated - Zero/Span 12/01/24 07:30 - M. Johnson

Turbidity Meter verified - 20 NTU standard 12/15/24 14:00 - J. Smith

📑 REPORTS

📍 Jump to Section

📑

Executive

🏢

Branding

📄

Report Type

👁️

Preview

📤

Export

📑 Executive Report Generator GENIUS v9.9.19

REPORT DATE

${new Date().toLocaleDateString()}

Auto-generated

PLANT STATUS

OPTIMAL

Health: 87%

DATA SOURCES

GENIUS systems

LAST GENERATED

Never

Click Generate

📋 REPORT SECTIONS (Click to toggle)

Executive Summary

Health, status, key metrics

Compliance Status

Permit status, alerts, DMR

Predictive Analytics

7-30 day forecasts

Benchmarking

Industry comparison

Optimization

Recommendations & savings

Energy Analysis

Usage & cost optimization

Capital Planning

Projects & scenarios

Strategic Outlook

Risks & opportunities

👁️ REPORT PREVIEW

📑

Click ⚡ Generate to create your executive report

Report will pull data from all 8 GENIUS systems

📤 EXPORT OPTIONS

📅 SCHEDULED REPORTS

Coming Soon

🏢 Company Branding

Company Name

Consultant Name

Phone

License #

📄 Select Report Type

📅

Daily Operations Report

Date, plant values, checklist status, daily notes, operator signature

⚙️

Process Summary Report

All calculator results, status indicators, formulas used

🏭

Client Visit Report

Plant profile, findings, recommendations, action items

🧮

Calculation Report

All inputs, outputs, formulas, with professional formatting

📋 Report Configuration

🏭 Plant Information

Plant Name

Client/Owner

Permit #

Report Date

Process Type

Design Flow (MGD)

📝 Notes & Comments

📤 Quick Export

🧮 ALL CALCULATORS

Process Loading • Chemical Dosing • Hydraulics • Clarifiers

📍 Jump to Calculator (50+ Available)

⚙️ PROCESS LOADING

🧫

OLR

⚖️

F/M

⏱️

SRT

🕐

HRT

🧪

SVI

🚿

WAS

🔄

RAS

☣️ CHEMICAL DOSING

☣️

Chlorine

💊

Polymer

🔶

Coagulant

⚗️

🌱

Carbon

👃

Odor

🧫

Dilution

🌊 HYDRAULICS & FLOW

⛽

Pumping

🌊

SOR

🔄

WOR

🔧

Pipes

〰️

Manning

🌊

Weir

🔬 ADVANCED

⚖️

Mass Bal

💨

OTE

⚠️

Risk

🔬

Nutrients

🧮 Process Calculators

🧫 Organic Loading Rate (OLR)

BOD Concentration (mg/L)

Flow Rate (MGD)

Aeration Volume (MG)

BOD Loading	-	lb/day
Organic Loading Rate	-	lb BOD/1000 cf/day

⚖️ F/M Ratio (Food to Microorganism)

BOD Loading (lb/day)

MLVSS (mg/L)

Aeration Volume (MG)

MLVSS Mass	-	lb
F/M Ratio	-	lb BOD/lb MLVSS/day
Status	-

⏱️ Sludge Retention Time (SRT)

MLSS (mg/L)

Aeration Volume (MG)

WAS Flow (MGD)

WAS TSS (mg/L)

Effluent Flow (MGD)

Effluent TSS (mg/L)

System Solids	-	lb
Solids Wasted	-	lb/day
SRT (Sludge Age)	-	days
Status	-

🕐 Hydraulic Detention Time (HRT)

Tank Volume (gallons)

Flow Rate (MGD)

Detention Time	-	hours
Status	-

📉 BOD Removal Efficiency

Influent BOD (mg/L)

Effluent BOD (mg/L)

Removal Efficiency: - %

BOD Removed	-	mg/L
Removal Efficiency	-	%
Status	-

🧪 Sludge Volume Index (SVI)

30-min Settled Volume (mL/L)

MLSS (mg/L)

SVI	-	mL/g
Settling Quality	-

🚿 Waste Activated Sludge (WAS)

Target SRT (days)

MLSS (mg/L)

Aeration Volume (MG)

WAS Concentration (mg/L)

Required WAS Flow	-	GPD
Solids Wasted	-	lb/day

🔄 Return Activated Sludge (RAS)

Influent Flow (MGD)

MLSS (mg/L)

RAS TSS (mg/L)

RAS Ratio	-	%
RAS Flow	-	MGD

☣️ Chlorine Dosing

Flow Rate (MGD)

Target Dose (mg/L)

Chlorine Required	-	lb/day
Solution (12.5%)	-	gal/day

💊 Polymer Dosing

Sludge Flow (GPM)

Solids Concentration (%)

Dose Rate (lb/dry ton)

Dry Solids	-	lb/hr
Polymer Required	-	lb/hr

🧪 Dechlorination (Sulfite)

💡 Dechlorination Info: Sodium bisulfite (SBS) or sulfur dioxide removes chlorine residual before discharge. Typical ratio: 1.0-1.5 mg SBS per 1.0 mg Cl₂. Adjust SG and Strength from your SDS.

Flow Rate (MGD)

Chlorine Residual (mg/L)

SBS:Cl₂ Ratio

Solution Strength (%) 📋 SDS

Specific Gravity 📋 SDS

Cost ($/gal)

SBS Required (100%)	-	lb/day
Solution Feed Rate	-	gal/day
Daily Cost	-	$/day

🔶 Coagulant Dosing (Ferric/Alum)

💡 Coagulation: Ferric chloride and alum are used for phosphorus removal and TSS reduction. Adjust SG and Strength from your SDS.

Flow Rate (MGD)

Target Dose (mg/L)

Chemical Type

Solution Strength (%) 📋 SDS

Specific Gravity 📋 SDS

Cost ($/gal)

Chemical Required	-	lb/day
Solution Feed Rate	-	gal/day
Feed Pump Setting	-	gal/hr
Daily Cost	-	$/day

⚖️ pH Adjustment

💡 pH Control: Caustic (NaOH) raises pH. Sulfuric acid (H₂SO₄) or CO₂ lowers pH. Adjust SG and Strength from your SDS.

Flow Rate (MGD)

Chemical Type

Current pH

Target pH

Alkalinity (mg/L CaCO₃)

Solution Strength (%) 📋 SDS

Specific Gravity 📋 SDS

Cost ($/gal or $/lb)

Estimated Chemical	-	lb/day
Solution Feed	-	gal/day
Daily Cost	-	$/day
Notes	-

🌱 Carbon Source Dosing

💡 Denitrification Carbon: External carbon needed when BOD:N ratio is too low. Adjust SG and C:N ratio from your SDS.

Flow Rate (MGD)

NO₃-N to Remove (mg/L)

Carbon Source

C:N Ratio (lb C/lb N) 📋 SDS

Specific Gravity 📋 SDS

Cost ($/gal)

N Load Removed	-	lb N/day
Carbon Required	-	lb/day
Feed Rate	-	gal/day
Daily Cost	-	$/day

👃 Odor Control Dosing

💡 H₂S Control: Ferrous/ferric salts, nitrate, or oxidizers control hydrogen sulfide. Adjust SG and Strength from your SDS.

Flow Rate (MGD)

H₂S Concentration (mg/L)

Treatment Chemical

Solution Strength (%) 📋 SDS

Specific Gravity 📋 SDS

Fe:S or Ox:S Ratio

Cost ($/gal)

Chemical Required	-	lb/day
Feed Rate	-	gal/day
Daily Cost	-	$/day

🧫 Chemical Dilution Calculator

💡 Dilution Formula: C₁V₁ = C₂V₂ (Concentration × Volume of stock = Concentration × Volume of diluted)

Stock Concentration (%)

Target Concentration (%)

Final Volume Needed (gal)

Stock Solution Needed	-	gallons
Water to Add	-	gallons
Dilution Ratio	-	: 1

⛽ Pumping & Hydraulics

Flow Rate (GPM)

Total Dynamic Head (ft)

Pump Efficiency (%)

Motor Efficiency (%)

Water Horsepower	-	HP
Brake Horsepower	-	HP
Motor Horsepower	-	HP
Power Draw	-	kW

⚗️ Alkalinity Requirements

TKN Removed (mg/L)

Flow Rate (MGD)

Alkalinity Consumed	-	mg/L as CaCO3
Daily Alk Required	-	lb/day

🌊 Surface Overflow Rate (SOR)

Flow Rate (MGD)

Clarifier Area (sq ft)

Surface Overflow Rate	-	gpd/sq ft	-
Status	-

🔄 Weir Overflow Rate (WOR)

Flow Rate (MGD)

Weir Length (ft)

Weir Overflow Rate	-	gpd/ft	-
Status	-

📊 Solids Loading Rate (SLR)

Flow Rate (MGD)

MLSS (mg/L)

RAS Flow (MGD)

Clarifier Area (sq ft)

Solids Loading Rate	-	lb/sq ft/day	-
Status	-

⏱️ Mean Cell Residence Time (MCRT)

Aeration Volume (MG)

MLSS (mg/L)

WAS Flow (MGD)

WAS TSS (mg/L)

Effluent Flow (MGD)

Effluent TSS (mg/L)

System Solids	-	lb
Solids Wasted	-	lb/day
MCRT	-	days
Status	-

💨 Oxygen Uptake Rate (OUR)

DO Start (mg/L)

DO End (mg/L)

Time (minutes)

MLVSS (mg/L)

OUR	-	mg/L/hr
SOUR	-	mg O2/g MLVSS/hr
Status	-

📅 Sludge Age Calculator (Multiple Methods) 5 Methods

Calculate SRT/MCRT using different methods. Compare results to verify accuracy.

📊 System Parameters

Aeration Volume (MG)

MLSS (mg/L)

MLVSS (mg/L)

Clarifier Volume (MG)

Clarifier TSS (mg/L)

Water Temperature (°C)

📊 Method 1: Standard SRT

SRT = Total System Solids ÷ Solids Wasted per Day

WAS Flow (GPD)

WAS TSS (mg/L)

⏱️ Method 2: MCRT (Mean Cell Residence Time)

MCRT = Total Solids ÷ (WAS Solids + Effluent Solids Loss)

WAS Flow (GPD)

WAS TSS (mg/L)

Effluent Flow (MGD)

Effluent TSS (mg/L)

🌡️ Method 3: Aerobic SRT (Nitrification Design)

Minimum SRT for nitrification based on temperature and safety factor

Design Temperature (°C)

Safety Factor

Max Nitrifier Growth (1/d)

⚖️ Method 4: F/M Ratio Based SRT

SRT estimated from F/M ratio: SRT ≈ 1 / (Y × F/M - kd)

BOD Loading (lb/day)

Yield Coefficient (Y)

Decay Rate (kd, 1/d)

🧮 Method 5: Kinetic Model (Monod)

SRT from Monod kinetics: SRT = (Ks + S) / (μmax × S - kd × (Ks + S))

Effluent BOD (S, mg/L)

Half-sat Constant (Ks)

Max Growth Rate (μmax, 1/d)

Decay Rate (kd, 1/d)

📚 SRT Guidelines by Process Type

Process Type	SRT (days)	F/M (lb/lb/d)	Notes
High-Rate AS	2-4	0.4-1.0	BOD removal only
Conventional AS	4-8	0.2-0.4	Good BOD removal
Nitrification	8-15	0.1-0.2	Complete nitrification
Extended Aeration	15-30	0.05-0.1	Low sludge production
MBR Systems	15-50	0.05-0.15	High MLSS operation

🌡️ Min SRT for Nitrification:

20°C: 4-5 days
15°C: 6-8 days
10°C: 10-15 days
5°C: 20+ days

⚠️ Common Issues:

SRT too low: Poor nitrification
SRT too high: Pin floc, high DO demand
Variable SRT: Inconsistent performance

🧪 Ammonia/TKN Removal

Influent NH3-N (mg/L)

Effluent NH3-N (mg/L)

Flow Rate (MGD)

NH3-N Removed	-	mg/L
Removal Efficiency	-	%
Mass Removed	-	lb/day
Alkalinity Consumed	-	lb/day as CaCO3

🔬 Phosphorus Removal

Influent TP (mg/L)

Effluent TP (mg/L)

Flow Rate (MGD)

Chemical (Alum/Ferric)

TP Removed	-	mg/L
Removal Efficiency	-	%
Chemical Dose Required	-	lb/day
Molar Ratio	-	mol/mol P

🌿 Nutrient Balance Calculator BNR Analysis

Complete nitrogen and phosphorus balance through the treatment process.

📥 Influent Characteristics

Flow (MGD)

BOD (mg/L)

TSS (mg/L)

TKN (mg/L)

NH3-N (mg/L)

Organic-N (mg/L)

Total P (mg/L)

Ortho-P (mg/L)

Temperature (°C)

⚙️ Process Configuration

Process Type

SRT (days)

MLSS (mg/L)

Anoxic Fraction (%)

Internal Recycle Ratio

RAS Ratio

🎯 Effluent Targets/Limits

NH3-N Limit (mg/L)

TN Limit (mg/L)

TP Limit (mg/L)

⚗️ Chemical Addition (if needed)

Carbon Source

P Removal Chemical

Alkalinity Available (mg/L)

📚 Nutrient Removal Guidelines

Process	TN Achievable	TP Achievable	Key Requirements
Conventional	25-35 mg/L	4-6 mg/L	BOD removal only
Nitrification	20-30 mg/L	4-6 mg/L	SRT >8d @ 20°C
Nit-Denit	8-12 mg/L	4-6 mg/L	Anoxic zone, carbon
BNR (MLE)	6-10 mg/L	1-2 mg/L	Bio-P + denit
Advanced BNR	3-5 mg/L	0.1-0.5 mg/L	Multiple stages, chem-P

N Stoichiometry:

Nitrification: 4.6 lb O₂/lb N
Denitrification: 2.9 lb BOD/lb N
Alkalinity: 7.1 lb CaCO₃/lb N (nit)
Recovery: 3.6 lb CaCO₃/lb N (denit)

P Stoichiometry:

Bio-P uptake: 0.01-0.02 lb P/lb BOD
Alum: 10:1 Al:P molar ratio
Ferric: 2:1 Fe:P molar ratio
Sludge P content: 2-7% in EBPR

🧫 TSS/VSS Removal Efficiency

Influent TSS (mg/L)

Effluent TSS (mg/L)

Influent VSS (mg/L)

Effluent VSS (mg/L)

TSS Removal	-	%
VSS Removal	-	%
VSS/TSS Ratio (In)	-
VSS/TSS Ratio (Out)	-

⚙️ Grit Chamber Sizing

Peak Flow (MGD)

Detention Time (min)

Depth (ft)

Width (ft)

Volume Required	-	cu ft
Length Required	-	ft
Surface Area	-	sq ft
Horizontal Velocity	-	ft/min

🔥 Anaerobic Digester Loading

Sludge Volume (gpd)

Sludge Solids (%)

VS/TS Ratio

Digester Volume (cu ft)

VS Loading	-	lb VS/day
Volumetric Loading	-	lb VS/cu ft/day
HRT	-	days
Status	-

🔬 MLSS/MLVSS Calculator

MLSS (mg/L)

VSS Ratio (%)

Aeration Volume (MG)

MLVSS	-	mg/L
Total Solids	-	lb
Volatile Solids	-	lb

🌊 Clarifier Loading Rates

Flow Rate (MGD)

Clarifier Diameter (ft)

RAS Flow (MGD)

Weir Length (ft)

MLSS (mg/L)

Surface Overflow Rate	-	gpd/sq ft
Weir Overflow Rate	-	gpd/ft
Solids Loading	-	lb/sq ft/day
Status	-

💨 Oxygen Transfer Efficiency

Airflow (SCFM)

Diffuser Depth (ft)

OTE at STP (%)

Temperature (°C)

Field OTE	-	%
O2 Delivered	-	lb O2/hr
SOTR	-	lb O2/hr

🔥 Digester Gas Production

VS Destroyed (lb/day)

Gas Production (cf/lb VS)

Methane Content (%)

Total Gas	-	cf/day
Methane Volume	-	cf/day
Energy Value	-	BTU/day
Power Potential	-	kW

🗜️ Belt Press / Centrifuge Calculator Dewatering

Comprehensive dewatering analysis for belt filter press and centrifuge operations.

⚙️ Equipment Configuration

Equipment Type

Number of Units

Units in Service

Belt Width / Bowl Diameter (m)

Operating Hours/Day

Days per Week

📥 Feed Sludge Characteristics

Sludge Type

Feed Rate (GPM)

Feed Solids (%)

Daily Sludge Volume (gal/day)

VS/TS Ratio

Specific Gravity

📊 Performance Parameters

Target Cake Solids (%)

Solids Capture (%)

Hydraulic Loading (GPM/m)

Solids Loading (lb/hr/m)

Belt Speed (m/min)

Belt Tension (psi)

⚗️ Polymer Conditioning

Polymer Type

Polymer Dose (lb/DT)

Polymer Solution (%)

Polymer Cost ($/lb active)

Wash Water (GPM)

Electricity Cost ($/kWh)

🚛 Disposal

Disposal Method

Disposal Cost ($/wet ton)

Truck Capacity (cubic yards)

📚 Dewatering Equipment Guidelines

Parameter	Belt Press	Centrifuge	Screw Press
Cake Solids (%)	18-25	20-30	15-25
Capture (%)	90-98	90-98	90-95
Polymer (lb/DT)	8-15	15-25	5-10
Energy (kWh/DT)	10-20	30-60	5-15
Wash Water	High	None	Low

Typical Cake Solids:

Primary: 28-34%
WAS: 15-20%
Mixed: 20-28%
Digested: 22-30%

Polymer Dose Range:

Primary: 3-8 lb/DT
WAS: 15-25 lb/DT
Digested: 10-18 lb/DT
Mixed: 8-15 lb/DT

💨 Blower Air Requirements

O2 Required (lb/day)

Transfer Efficiency (%)

Diffuser Depth (ft)

Air Required	-	SCFM
Blower HP (est)	-	HP
Annual Energy	-	kWh/yr

☀️ UV Disinfection Calculator Comprehensive

Design and evaluate UV disinfection systems for various applications.

⚙️ System Configuration

Design Flow (MGD)

Peak Flow Factor

Number of Channels

UV System Type

Application

Redundancy

💧 Water Quality Parameters

UVT - UV Transmittance (%)

TSS (mg/L)

Iron (mg/L)

Turbidity (NTU)

Color (CU)

Hardness (mg/L as CaCO3)

☢️ Dose Requirements

Target Pathogen

Target Log Reduction

Design UV Dose (mJ/cm²)

End-of-Lamp Factor

Fouling Factor

Safety Factor

💰 Operating Costs

Electricity Cost ($/kWh)

Lamp Cost ($)

Lamp Life (hours)

📚 UV Dose Guidelines

Pathogen	Log Reduction	Dose (mJ/cm²)
E. coli	4-log	20-25
Fecal Coliform	4-log	30-40
Giardia	3-log	11
Cryptosporidium	3-log	12
Virus (Adeno)	4-log	186
CA Title 22 Reuse	5-log virus	100-140

UVT Guidelines:

Secondary: 55-65%
Tertiary: 65-75%
Reuse: 70-85%
Drinking: >90%

Lamp Types:

LP: 254nm, efficient, longer life
LPHO: Higher output, fewer lamps
MP: Broad spectrum, compact

🔄 Sludge Thickening

Feed Flow (GPM)

Feed Solids (%)

Thickened Solids (%)

Capture Rate (%)

Dry Solids In	-	lb/hr
Thickened Flow	-	GPM
Solids Captured	-	lb/hr
Volume Reduction	-	%

⚖️ Equalization Basin Sizing

Peak Flow (MGD)

Average Flow (MGD)

Peak Duration (hrs)

Storage Volume	-	MG
Storage Volume	-	gallons
Peak-to-Avg Ratio	-

🌧️ Wet Weather & I/I Calculator Storm Analysis

Analyze wet weather impacts, I&I contribution, and treatment capacity during storm events.

📊 Baseline (Dry Weather) Conditions

Avg Dry Weather Flow (MGD)

Min Daily Flow (MGD)

Max Dry Weather Flow (MGD)

Service Area (acres)

Population Served

Sewer Length (miles)

🌧️ Storm Event Data

Peak Wet Weather Flow (MGD)

Storm Duration (hours)

Rainfall Amount (inches)

Storm Recurrence (years)

Groundwater Level

Season

🏭 Treatment Capacity

Design Capacity (MGD)

Peak Hydraulic Capacity (MGD)

Bypass/SSO Threshold (MGD)

EQ/Storage Available (MG)

Avg Influent BOD (mg/L)

Permit BOD Limit (mg/L)

📚 Wet Weather Guidelines

Parameter	Typical Range	Concern Level
Peak/Avg Flow Ratio	2.0-3.0	>4.0 = High I&I
I&I Rate (gpd/mi)	2,000-5,000	>10,000 = Excessive
I&I Rate (gpd/capita)	20-50	>100 = Excessive
RDII (gal/in/acre)	500-2,000	>5,000 = High
Peaking Factor	2.5-3.5	>5.0 = I&I issues

I&I Sources:

Inflow: Direct connections
- Roof drains, sump pumps
- Cross-connections
Infiltration: Groundwater
- Cracked pipes, joints
- Manholes, laterals

Treatment Impacts:

- Diluted influent (low BOD)
- Hydraulic overload
- Solids washout risk
- Reduced SRT
- Nitrification loss
- SSO/bypass risk

🧪 Chemical Feed Rate

Flow Rate (MGD)

Target Dose (mg/L)

Solution Strength (%)

Specific Gravity

Chemical (dry)	-	lb/day
Solution Volume	-	gal/day
Feed Rate	-	gal/hr
Feed Rate	-	mL/min

🗑️ Screenings & Grit Estimation

Average Flow (MGD)

Screen Opening (in)

Population Served

Screenings	-	cu ft/day
Screenings	-	cu yd/month
Grit Volume	-	cu ft/day
Grit	-	cu yd/month

🏗️ Primary Clarifier Performance

Influent BOD (mg/L)

Influent TSS (mg/L)

Surface Overflow Rate (gpd/sf)

Est. BOD Removal	-	%
Est. TSS Removal	-	%
Effluent BOD	-	mg/L
Effluent TSS	-	mg/L

🔄 Trickling Filter Loading

Flow Rate (MGD)

BOD (mg/L)

Media Volume (cu ft)

Recirculation Ratio

Organic Loading	-	lb BOD/1000 cf/day
Hydraulic Loading	-	gpd/sq ft
Est. BOD Removal	-	%

🌱 Biosolids Land Application

Dry Tons/Year

% Nitrogen

N Application Rate (lb/ac/yr)

% Available N

Total N	-	lb/yr
Available N	-	lb/yr
Land Required	-	acres
Application Rate	-	dry tons/acre

📐 Hydraulic Profile Calculator

Calculate water surface elevations (WSE) through treatment units. Enter starting elevation and head losses to generate the hydraulic grade line.

📍 Starting Conditions

Design Flow (MGD)

Peak Flow Factor

Outfall WSE (ft)

🏭 Unit Process Head Losses (ft)

Enter head loss across each unit at peak flow. Use 0 for units not present.

Preliminary Treatment

Bar Screen

Grit Chamber

Flow Measurement

Primary Treatment

Primary Clarifier Inlet

Primary Clarifier

Primary Effluent Weir

Secondary Treatment

Aeration Basin Inlet

Aeration Basin

Secondary Clarifier Inlet

Secondary Clarifier

Secondary Effluent Weir

Tertiary/Effluent

Filters

UV/Disinfection

Effluent Piping

Cascade Aerator

🔧 Pipe Headloss (Hazen-Williams)

Calculate friction headloss in pipes using Hazen-Williams equation

Flow Rate (GPM)

Pipe Diameter (in)

Pipe Length (ft)

C-Factor

Fittings K-value

Velocity	-	ft/s
Friction Loss	-	ft
Fitting Losses	-	ft
Total Head Loss	-	ft
Head Loss per 100 ft	-	ft/100 ft

🌊 Weir & Orifice Head Loss

Calculate head over weirs and through orifices

Rectangular Weir

Flow (MGD)

Weir Length (ft)

Weir Coefficient

Head over Weir: - ft

Circular Orifice

Flow (GPM)

Orifice Diameter (in)

Discharge Coefficient

Head Required: - ft

〰️ Open Channel Flow (Manning's)

Calculate flow depth and velocity in open channels using Manning's equation

Flow Rate (MGD)

Channel Width (ft)

Channel Slope (ft/ft)

Manning's n

Side Slope (H:V, 0=vertical)

Normal Depth	-	ft
Flow Area	-	sq ft
Wetted Perimeter	-	ft
Hydraulic Radius	-	ft
Velocity	-	ft/s
Froude Number	-

⚗️ Chemical Feed Rate Optimizer

Optimize chemical dosing based on target removal and real-time conditions

📊 Current Conditions

Flow Rate (MGD)

Influent Phosphorus (mg/L)

Target Effluent P (mg/L)

Current pH

Alkalinity (mg/L as CaCO3)

💊 Chemical Selection

Primary Chemical

Solution Strength (%)

Specific Gravity

Chemical Cost ($/lb)

Molar Ratio Target (Me:P)

🌊 Equalization Basin Sizing

Size EQ basins for flow and load equalization based on diurnal patterns

Average Daily Flow (MGD)

Peak Hour Flow (MGD)

Minimum Hour Flow (MGD)

Target Equalized Flow (MGD)

Operating Depth (ft)

Freeboard (ft)

Safety Factor

📈 Hourly Flow Pattern (24-hr)

Enter flows as % of average (default pattern loaded)

12AM

2AM

4AM

6AM

8AM

10AM

12PM

2PM

4PM

6PM

8PM

10PM

⚠️ Violation Risk Predictor

Predict probability of permit violations based on current performance and variability

📋 Permit Limits

BOD Daily Max (mg/L)

BOD Monthly Avg (mg/L)

TSS Daily Max (mg/L)

TSS Monthly Avg (mg/L)

NH3-N Daily Max (mg/L)

📊 Current Performance (30-day)

BOD Average (mg/L)

BOD Std Deviation

TSS Average (mg/L)

TSS Std Deviation

NH3-N Average (mg/L)

NH3-N Std Deviation

⚖️ Mass Balance Calculator

Calculate mass balances for BOD, TSS, nitrogen, and phosphorus through the treatment process

📥 Influent Conditions

Flow (MGD)

BOD (mg/L)

TSS (mg/L)

TKN (mg/L)

Total P (mg/L)

Primary Treatment

BOD Removal (%)

TSS Removal (%)

Secondary Treatment

BOD Removal (%)

TSS Removal (%)

TKN Removal (%)

Tertiary/Chemical

P Removal (%)

Additional TSS (%)

Sludge Yield (lb VSS/lb BOD)

VSS/TSS Ratio

Primary Sludge (% solids)

WAS (% solids)

💨 Oxygen Transfer Efficiency (OTE) Calculator

Calculate actual oxygen transfer rate (AOTR) from standard conditions and evaluate aeration efficiency

🔧 System Parameters

Diffuser Type

SOTE @ SWD (%)

Submergence Depth (ft)

Airflow Rate (SCFM)

Number of Diffusers

🌡️ Process Conditions

Water Temperature (°C)

Operating DO (mg/L)

Altitude (ft)

Alpha Factor (α)

Beta Factor (β)

Fouling Factor (F)

Oxygen Required (lb O₂/day)

Blower Efficiency (%)

Motor Efficiency (%)

Electricity Cost ($/kWh)

🔄 Pump Station Calculator Lift Station

Design and analyze pump stations: wet well sizing, pump selection, cycle times, and energy costs.

📊 Design Flows

Average Daily Flow (MGD)

Peak Hour Flow (MGD)

Peaking Factor

Min Flow (MGD)

Design Life (years)

Growth Factor (%/yr)

🪣 Wet Well Design

Wet Well Shape

Diameter / Length (ft)

Width (ft) - Rect only

Lead Pump On (ft from bottom)

Lead Pump Off (ft)

Lag Pump On (ft)

High Level Alarm (ft)

Min Submergence (ft)

Freeboard (ft)

⚙️ Pump Configuration

Number of Pumps

Pump Capacity Each (GPM)

Pump Type

Total Dynamic Head (ft)

Pump Efficiency (%)

Motor Efficiency (%)

💰 Energy & Costs

Electricity Cost ($/kWh)

Demand Charge ($/kW)

VFD Installed?

📚 Pump Station Design Guidelines

Parameter	Typical Range	Notes
Min Cycle Time	5-10 min	Prevents motor overheating
Max Starts/Hour	6-12	Check motor rating
Detention Time	<30 min	Prevents septicity
Min Velocity	2-3 fps	Prevents settling
VFD Savings	20-50%	Affinity laws (cube of speed)

🔬 Membrane Calculator (MBR/RO/UF) Filtration

Design and analyze membrane systems: MBR, UF, MF, RO, and NF applications.

⚙️ System Configuration

Membrane Type

Design Flow (MGD)

Peak Factor

Recovery (%)

Number of Trains

Temperature (°C)

📈 Operating Parameters

Design Flux (GFD)

TMP (psi)

Clean Permeability (GFD/psi)

🔧 Module Specifications

Module Area (sq ft)

Modules per Cassette

Module Cost ($)

Module Life (years)

CIP Interval (days)

CIP Duration (hours)

💰 Operating Costs

Electricity ($/kWh)

CIP Chemical Cost ($/clean)

📚 Membrane Design Guidelines

Type	Typical Flux (GFD)	TMP (psi)	Recovery	Life (yrs)
MBR	10-20	1-5	N/A	7-10
UF	30-60	10-30	90-95%	5-7
MF	40-80	5-15	90-95%	5-7
RO	15-25	150-400	75-85%	3-5
NF	20-35	75-150	80-90%	3-5

🫧 DAF Calculator (Dissolved Air Flotation) Flotation

Design dissolved air flotation systems for TSS, FOG, and algae removal.

📊 Design Parameters

Design Flow (MGD)

Peak Factor

Number of Units

📥 Influent Characteristics

Influent TSS (mg/L)

Influent FOG (mg/L)

Influent BOD (mg/L)

Temperature (°C)

⚙️ Design Criteria

Surface Loading (lb TSS/sf/d)

Hydraulic Loading (GPM/sf)

A/S Ratio (lb air/lb solids)

Recycle Rate (%)

Saturator Pressure (psi)

🎯 Performance Targets

TSS Removal (%)

FOG Removal (%)

💰 Operating Costs

Electricity ($/kWh)

Polymer Dose (mg/L)

Polymer Cost ($/lb)

📚 DAF Design Guidelines

Parameter	Typical Range	Notes
A/S Ratio	0.01-0.05	lb air/lb solids removed
Recycle Rate	20-50%	Of influent flow
Saturator Pressure	40-80 psi	Higher = more air dissolved
Hydraulic Loading	2-6 GPM/sf	Based on total flow
Solids Loading	1-4 lb/sf/day	TSS basis
Float Solids	2-6%	Typical without thickening

🗑️ SOLIDS HANDLING

📍 Jump to Section

🚿

WAS Calc

⚙️

Adv WAS

🔄

RAS Calc

🌊

Clarifier

📏

Blanket

🔄

Thickener

🔥

Biogas

🚛

Septage

📊 Sludge Production Estimator

Estimate daily sludge production from primary and secondary treatment

Flow (MGD)

Influent TSS (mg/L)

Primary TSS Removal (%)

Influent BOD (mg/L)

Yield Coefficient (lb VSS/lb BOD)

VSS/TSS Ratio

🚿 WAS (Waste Activated Sludge) Calculator

Calculate WAS rate based on target SRT

Aeration Volume (MG)

MLSS (mg/L)

Target SRT (days)

WAS Concentration (mg/L)

Aeration Inventory	-	lb
WAS Rate (mass)	-	lb/day
WAS Rate (volume)	-	gpd
WAS Rate	-	gpm

🚿 Advanced WAS Calculator Multiple Methods

Calculate WAS using different control strategies. Select your preferred method.

📅 SRT (Solids Retention Time) Control

Most common method. WAS rate = Total solids inventory ÷ Target SRT

Aeration Volume (MG)

MLSS (mg/L)

Target SRT (days)

Clarifier Volume (MG)

Blanket Depth (ft)

RAS Concentration (mg/L)

Effluent TSS (mg/L)

Process Type	SRT (days)	F/M	MLSS (mg/L)
Conventional AS	5-15	0.2-0.5	1,500-3,000
Extended Aeration	20-40	0.04-0.1	3,000-6,000
Contact Stabilization	5-10	0.2-0.6	1,000-3,000
SBR	10-30	0.04-0.1	2,000-5,000
MBR	10-25	0.1-0.4	8,000-12,000
Nitrification	10-20	0.1-0.3	2,000-4,000

🔄 RAS (Return Activated Sludge) Calculator Multiple Methods

Calculate optimal RAS rate to maintain target MLSS and prevent settling issues.

📊 RAS Ratio Method

Calculate RAS based on desired RAS/Q ratio. Typical range: 25-100% of influent flow.

Influent Flow (MGD)

Target RAS Ratio (%)

MLSS (mg/L)

RAS Concentration (mg/L)

Number of RAS Pumps

Pump Capacity (gpm each)

🎯 Target MLSS Method

Calculate RAS rate needed to achieve target MLSS based on mass balance.

Influent Flow (MGD)

Target MLSS (mg/L)

Current MLSS (mg/L)

RAS Concentration (mg/L)

Influent TSS (mg/L)

Aeration Volume (MG)

📏 Sludge Blanket Control Method

Adjust RAS to maintain target sludge blanket depth in clarifier.

Influent Flow (MGD)

Current Blanket (ft)

Target Blanket (ft)

Clarifier Side Water Depth (ft)

Current RAS Rate (MGD)

SVI (mL/g)

MLSS (mg/L)

Clarifier Surface Area (sf)

Adjustment Factor

📚 RAS Operating Guidelines

Parameter	Typical Range	Notes
RAS Ratio (RAS/Q)	25-100%	Higher during high flows
RAS Concentration	6,000-12,000 mg/L	Should be 2-4x MLSS
Sludge Blanket	1-3 ft	Keep below weir level
RAS TSS/MLSS Ratio	2.0-4.0	Lower indicates poor settling
Clarifier SLR	20-35 lb/sf/day	Peak: 50 lb/sf/day max

⚠️ RAS Troubleshooting:

Rising blanket: Increase RAS rate or reduce WAS
Low RAS concentration: Check for denitrification, reduce RAS rate
RAS > 100%: Check for hydraulic issues, high SVI
Thin blanket: May reduce RAS, but monitor effluent TSS

🏊 Clarifier Loading Calculator SLR, SOR, WLR

Calculate solids loading rate (SLR), surface overflow rate (SOR), and weir loading rate (WLR) for secondary clarifiers.

🏗️ Clarifier Configuration

Number of Clarifiers

Clarifier Diameter (ft)

Side Water Depth (ft)

Center Well Diameter (ft)

Weir Length per Clarifier (ft) Perimeter = πD

Clarifiers Online

💧 Flow & Solids Data

Influent Flow (MGD)

RAS Flow (MGD)

MLSS (mg/L)

Peak Flow Factor

SVI (mL/g)

RAS Concentration (mg/L)

📚 Secondary Clarifier Design Criteria

Parameter	Average	Peak	Units
Surface Overflow Rate (SOR)	400-800	1,000-1,200	gpd/sf
Solids Loading Rate (SLR)	20-30	50	lb/sf/day
Weir Loading Rate (WLR)	10,000-20,000	30,000	gpd/lf
Hydraulic Detention Time	1.5-2.5	-	hours
Side Water Depth	12-15	-	ft

✓ Good Settling

SVI < 120, SLR < 25

⚠️ Fair Settling

SVI 120-180, SLR 25-35

✗ Poor Settling

SVI > 180, SLR > 35

🧪 Sludge Judge / Settleometer 30-Min Settling Test

Record settling test readings and calculate SVI, settling rate, and sludge characteristics.

⚙️ Test Setup

Sample Location

MLSS Concentration (mg/L)

Cylinder Volume (mL)

Test Date

Test Time

Stirred Test (SSVI)?

📏 Settling Readings (mL)

Enter settled sludge volume at each time interval. Start with initial volume (usually 1000 or 2000 mL).

0 min

5 min

10 min

15 min

20 min

25 min

30 min *

60 min

📚 SVI Interpretation Guide

SVI (mL/g)	Settling Quality	Sludge Condition	Action
< 80	Excellent	Old sludge, pin floc possible	May reduce WAS, check effluent TSS
80-120	Good	Normal, healthy sludge	Maintain current operations
120-150	Fair	Light bulking beginning	Monitor closely, check DO/nutrients
150-200	Poor	Bulking sludge	Identify filaments, adjust process
> 200	Very Poor	Severe bulking	Immediate action required

SVI Formula:

SVI = (Settled Vol mL × 1000) / (Cylinder mL × MLSS mg/L)

Typical Targets:

Conventional: 80-150
Extended Air: 100-200
MBR: N/A (no settling)

🔄 Gravity Thickener Loading

Sludge Flow (gpd)

Feed TSS (%)

Thickener Diameter (ft)

Surface Area	-	sf
Hydraulic Loading	-	gpd/sf
Solids Loading	-	lb/sf/day
Status	-

🗜️ Dewatering Performance

Feed Rate (gpm)

Feed Solids (%)

Cake Solids (%)

Polymer Dose (lb/DT)

Polymer Cost ($/lb)

⚖️ Plant Mass Balance

For comprehensive mass balance calculations including BOD, TSS, TKN, and TP through the entire treatment train, see the Mass Balance Calculator in the 📐 Hydraulics tab.

🔥 Biogas & Digester Calculator Comprehensive

Complete anaerobic digester analysis: loading, gas production, heating, and energy recovery.

🏗️ Digester Configuration

Number of Digesters

Digester Diameter (ft)

Sidewater Depth (ft)

Digester Type

Operating Temperature (°F)

Digesters Online

📥 Sludge Feed

Primary Sludge (gpd)

PS Solids (%)

PS VS/TS Ratio

WAS/Thickened Sludge (gpd)

WAS Solids (%)

WAS VS/TS Ratio

⚡ Performance Parameters

VS Destruction (%)

Gas Production (cf/lb VS destroyed)

Methane Content (%)

💰 Energy & Economics

CHP Efficiency (%)

Electricity Cost ($/kWh)

Natural Gas Cost ($/therm)

📚 Digester Design Guidelines

Parameter	Standard Rate	High Rate	Two-Stage
SRT (days)	30-60	10-20	10-15 (1st)
VS Loading (lb/cf/d)	0.03-0.10	0.15-0.40	0.25-0.50
VS Destruction (%)	35-50	50-65	55-65
Temperature (°F)	Ambient	95 (meso)	95-131
Mixing	None	Continuous	Both stages

Gas Composition:

CH₄: 60-70%
CO₂: 30-40%
H₂S: 0.1-0.5%
Trace: N₂, H₂, etc.

Energy Content:

Biogas: ~600 BTU/cf
Methane: ~1,000 BTU/cf
1 cf CH₄ = 0.01 therm
1 kWh = 3,412 BTU

🚛 Septage Receiving Calculator Hauled Waste

Calculate septage receiving capacity, loading impacts, and revenue potential.

🏭 Plant Baseline

Design Flow (MGD)

Current Avg Flow (MGD)

Available Capacity (%)

Current BOD Load (lb/day)

BOD Capacity (lb/day)

Current TSS Load (lb/day)

🚛 Septage Characteristics

Septage Type

BOD (mg/L)

TSS (mg/L)

TKN (mg/L)

NH3-N (mg/L)

FOG (mg/L)

📥 Receiving Operations

Truck Size (gallons)

Trucks per Day

Operating Hours/Day

Receiving Rate (GPM)

Max Daily Volume (gal)

Discharge Point

💰 Economics

Tipping Fee ($/gallon)

Alternative: $/1000 gal

Treatment Cost ($/gal)

📚 Typical Septage Characteristics

Parameter	Residential	Commercial	Grease Trap	Portable
BOD (mg/L)	2,000-10,000	1,500-5,000	15,000-150,000	5,000-15,000
TSS (mg/L)	5,000-30,000	3,000-15,000	5,000-50,000	10,000-40,000
TKN (mg/L)	200-1,000	150-500	50-200	500-2,000
FOG (mg/L)	5,000-15,000	3,000-10,000	50,000-150,000	2,000-8,000

⚠️ Considerations:

- Slug loading impacts
- FOG handling capacity
- Grit removal needs
- Odor control
- Screenings increase

✅ Best Practices:

- Meter all loads
- Sample periodically
- Controlled discharge rate
- Spread throughout day
- Maintain manifest records

📦 Sludge Box (Dry) Haul Calculator Roll-off/Dumpster

Calculate sludge box capacity, hauling frequency, and costs for dewatered cake disposal.

🗜️ Cake Production

Daily Cake Production

Unit

Cake Solids (%)

Cake Density (lb/cy)

Operating Days/Week

Storage Days Available

📦 Box Configuration

Box Type

Box Capacity (cubic yards)

Fill Percentage (%)

Number of Boxes On-Site

Max Weight Limit (tons)

Limiting Factor

💰 Hauling & Disposal Costs

Haul Cost ($/pull)

Disposal Fee ($/ton)

Box Rental ($/box/month)

Fuel Surcharge (%)

Environmental Fee ($/haul)

Destination

📚 Sludge Box Reference

Box Size	Capacity (CY)	Typical Weight Limit	Best For
Lugger Box	10-15	8-12 tons	Small plants, limited space
20 CY Roll-off	20	15-18 tons	Small-medium plants
30 CY Roll-off	30	20-22 tons	Most common size
40 CY Roll-off	40	20-25 tons	Large plants, light cake

Typical Cake Densities:

Belt Press (20%): 1,000-1,200 lb/cy
Centrifuge (25%): 1,200-1,400 lb/cy
Plate Press (35%): 1,400-1,600 lb/cy
Dried (90%+): 800-1,000 lb/cy

Cost Factors:

- Haul distance
- Fuel prices
- Disposal facility type
- Weekend/holiday rates
- Contamination charges

📐 INTERACTIVE NOMOGRAPHS

Visual calculation tools for process, chemical & solids parameters

📖 How to Use Nomographs - Reference Guide

▼

📐 What are Nomographs?

Nomographs are visual calculation tools that allow operators to quickly determine process parameters by inputting known values. Originally paper-based graphical calculators, these digital versions provide instant results with visual feedback scales showing where your values fall within typical operating ranges.

🎯 How to Use

Enter Your Values

Type your plant's actual values into the input fields. Calculations update automatically as you type.

Read the Results

View calculated values in the result boxes. Large numbers show your primary result.

Check the Visual Scale

The sliding marker shows where your value falls. Green = good, Yellow = caution, Red = action needed.

Review Status Messages

Read interpretation text for specific guidance on what your results mean and actions to consider.

🎨 Visual Scale Legend

Green = Optimal range

Yellow = Caution/Monitor

Red = Outside limits

White marker = Your value

📊 Quick Reference - Typical Ranges

⚙️ Process/Biological

Parameter	Low	Optimal	High	Notes
SRT (days)	<5	5-15	>25	Extended aeration: 15-30
F/M Ratio	<0.05	0.1-0.4	>0.5	Extended aeration: 0.05-0.15
Overflow Rate (gpd/sf)	<400	400-800	>1200	Peak: <1,200
Solids Loading (lbs/d/sf)	<15	20-30	>50	Secondary clarifier
SVI (mL/g)	<50	80-150	>200	>150 = bulking possible

⚗️ Chemical/Disinfection

Parameter	Minimum	Target	Notes
CT Value (mg·min/L)	25	>37	25=2-log Giardia, 37=3-log, adjust for pH/temp
Cl₂ Residual (mg/L)	0.5	1-2	Check permit for max limit
Contact Time (min)	15	30+	At peak flow conditions

🚛 Solids/Digestion

Parameter	Typical Range	Notes
Gas Production (cf/lb VS)	12-18	VS destroyed basis
VS Destruction (%)	50-60%	Mesophilic anaerobic
Methane Content (%)	60-70%	Balance mostly CO₂
Polymer Dose (lbs/DT)	15-25	Varies by sludge type
Belt Press Cake (%)	18-25%	Centrifuge: 22-30%
GBT Loading (lbs/hr/sf)	40-100	DAF: 20-40, Gravity: 5-15/day

💡 Tips for Best Results

✓ Use lab-verified values for most accurate results

✓ Track trends over time - single readings can be misleading

✓ Consider seasonal variations when interpreting results

✓ Use multiple nomographs together for complete process picture

✓ Typical ranges may vary - know your plant's optimal conditions

📝 Key Formulas

SRT = (Vol × MLSS × 8.34) ÷ (WAS Flow × WAS Conc × 8.34 ÷ 1,000,000)
F/M = (Flow × BOD × 8.34) ÷ (Vol × MLVSS × 8.34)
Overflow Rate = Flow (gpd) ÷ Surface Area (sf)
Solids Loading = (Flow × MLSS × 8.34) ÷ Surface Area
SVI = (Settled Vol mL/L × 1000) ÷ MLSS mg/L
CT = Cl₂ Residual (mg/L) × Contact Time (min)
Cl₂ lbs/day = Flow (MGD) × Dose (mg/L) × 8.34
Gas Production = VS Destroyed (lbs) × Gas Yield (cf/lb)
Dry Solids = Flow (GPM) × 60 × 8.34 × (% Solids ÷ 100)

⚙️ Process/Biological Nomographs

📊 SRT/MCRT Calculator

Sludge Retention Time

Aeration Volume (MG)

MLSS (mg/L)

WAS Flow (GPD)

WAS Conc. (mg/L)

Solids Inventory

lbs

Solids Wasted/Day

lbs/day

SRT

days

SRT Scale (days)

051015202530+

Formula: SRT = (Vol × MLSS × 8.34) ÷ (WAS Flow × WAS Conc × 8.34 ÷ 1,000,000) • Typical: 5-15 days (conventional), 15-30 days (extended aeration)

📊 F/M Ratio Calculator

Food to Microorganism

Flow (MGD)

Influent BOD (mg/L)

Aeration Volume (MG)

MLVSS (mg/L)

BOD Loading

lbs/day

MLVSS Inventory

lbs

F/M Ratio

lb BOD/lb MLVSS/day

F/M Scale

00.10.20.30.40.50.6+

Formula: F/M = (Flow × BOD × 8.34) ÷ (Vol × MLVSS × 8.34) • Typical: 0.05-0.15 (extended aeration), 0.2-0.5 (conventional)

📊 Clarifier Loading Calculator

Surface & Solids Loading

Flow (MGD)

Clarifier Diameter (ft)

MLSS (mg/L)

RAS Rate (%)

Surface Area

sq ft

Overflow Rate

gpd/sq ft

Solids Loading

lbs/day/sq ft

Overflow Rate typical: 400-800 gpd/sf (avg), <1,200 (peak) • Solids Loading typical: 20-30 lbs/day/sf (max ~50)

📊 SVI & Settling Calculator

Sludge Volume Index

30-min Settled Volume (mL/L)

MLSS (mg/L)

Settled Volume

mL/L

1000 ÷ MLSS

factor

SVI

mL/g

SVI Scale (mL/g)

050100150200250300+

Enter values to see SVI interpretation

Formula: SVI = (Settled Volume × 1000) ÷ MLSS • Good: 80-150 mL/g • Bulking: >150 mL/g • Pinpoint floc: <50 mL/g

⚗️ Chemical/Disinfection Nomographs

📊 Chlorine CT Calculator

Contact Time × Concentration

Chlorine Residual (mg/L)

Contact Time (min)

Temperature (°C)

Cl₂ Residual

mg/L

Contact Time

minutes

CT Value

mg·min/L

CT Requirements (EPA) at pH 7, 20°C:

2-log Giardia

CT ≥ 25

3-log Giardia

CT ≥ 37

4-log Virus

CT ≥ 4

Enter values to see disinfection status

Formula: CT = C × T • Higher pH reduces HOCl effectiveness • Lower temp requires higher CT

📊 Chlorine Dosing Calculator

Feed Rate & Usage

Flow (MGD)

Desired Dose (mg/L)

Solution Strength (%)

Specific Gravity

Cl₂ Required

lbs/day

Solution Feed

gpd

Pump Setting

gph

Monthly Usage

gallons

Formula: lbs/day = Flow × Dose × 8.34 • GPD = lbs/day ÷ (8.34 × SG × %/100)

📊 pH Adjustment Calculator

Caustic/Acid Dosing

Current pH

Target pH

Alkalinity (mg/L as CaCO₃)

Flow (MGD)

Enter values to calculate

NaOH (50%) Dose

gpd

Lime (Ca(OH)₂) Dose

lbs/day

Soda Ash Dose

lbs/day

Note: Estimates based on alkalinity buffering. Actual dose varies with water chemistry. Jar test recommended.

🚛 Solids/Digestion Nomographs

📊 Digester Gas Production

Methane & Energy

VS Loading (lbs/day)

VS Destruction (%)

Gas Production (cf/lb VS)

Methane Content (%)

VS Destroyed

lbs/day

Total Gas

cf/day

Methane

cf/day

Energy Value

BTU/day

Equiv. kWh: --

Equiv. Therms: --

$/day @ $0.12/kWh: --

Typical: 12-18 cf gas/lb VS destroyed • Methane: 60-70% • Energy: ~600 BTU/cf methane

📊 Dewatering & Polymer Calculator

Belt Press / Centrifuge

Sludge Flow (GPM)

Feed Solids (%)

Cake Solids (%)

Polymer Dose (lbs/DT)

Dry Solids

lbs/hr

Cake Production

lbs/hr wet

Polymer Usage

lbs/hr

Dry Tons/Day

DT/day (8hr)

Typical polymer: 15-25 lbs/DT • Belt press cake: 18-25% • Centrifuge cake: 22-30%

📊 Thickener Loading Calculator

GBT / DAF / Gravity

Sludge Flow (GPM)

Feed Solids (%)

Thickened Solids (%)

Thickener Area (sq ft)

Solids Loading

lbs/hr/sf

Hydraulic Loading

gpm/sf

Thickened Flow

GPM

Concentration Ratio

GBT typical: 40-100 lbs/hr/sf • DAF: 20-40 lbs/hr/sf • Gravity: 5-15 lbs/day/sf

🧭 WIZARDS & DIAGNOSTICS

📍 Jump to Section

📊

Health

🧭

Wizards

🔮

Sims

📚

SOPs

⚖️

Mass Bal

📊 System Health Score

Health

/100

● Process Control: Excellent

● Effluent Quality: Good

● Equipment Status: Monitor

● Compliance: In Limits

🧭 Select a Troubleshooting Wizard

Choose a problem to diagnose. Each wizard will guide you through step-by-step questions to identify the root cause and recommend solutions.

🔴

High Effluent TSS

TSS exceeding permit limits? Diagnose clarifier, biological, and hydraulic causes.

8 Decision Points →

🟠

Filamentous Bulking

SVI > 150? Poor settling? Identify filament type and targeted solutions.

10 Decision Points →

🔵

High Effluent Ammonia

NH₃-N above limits? Check nitrification, DO, alkalinity, and toxicity.

9 Decision Points →

🟢

Low DO Problems

Can't maintain DO setpoint? Diagnose aeration, loading, and equipment issues.

8 Decision Points →

🟤

Foam/Scum Issues

Excessive foam on basins or clarifiers? Identify foam type and control strategies.

6 Decision Points →

👃

Odor Control

H₂S or septic odors? Locate sources and implement control measures.

7 Decision Points →

🟣

Nutrient Removal

High phosphorus or nitrogen? Optimize Bio-P, chemical, and denitrification.

10 Decision Points →

⚡

Blower/Aeration

Equipment issues, high amps, surge? Diagnose blower and air distribution problems.

9 Decision Points →

🔧

Clarifier Mechanical

High torque, scum issues, weir problems? Troubleshoot clarifier equipment.

8 Decision Points →

💧

RAS/WAS Optimization

Sludge return issues? Optimize RAS rate, WAS control, and maintain MLSS.

8 Decision Points →

🧭 Wizard Active

Step 1 of 8 12%

Question will appear here...

📍 Diagnosis Path:

Start → ...

✅ Diagnosis Complete

📜 Recent Diagnoses

No diagnoses completed yet. Run a wizard to see your history here.

🏭 MULTI-PLANT

🏭 Multi-Plant Fleet Management

🏭 Fleet Operations Dashboard

Centralized monitoring and management for multiple treatment facilities

Total Plants

Total Capacity

18.5 MGD

Online

Avg Efficiency

93.1%

Total Flow

15.1 MGD

Avg Load

82%

📊 Fleet Performance Comparison

North Regional WWTP ONLINE

📍 Houston, TX

Capacity: 5.0 MGD

Flow: 4.2 MGD

Efficiency: 94.5%

Load: 84%

South Municipal Plant ONLINE

📍 Pearland, TX

Capacity: 3.5 MGD

Flow: 2.8 MGD

Efficiency: 92.1%

Load: 80%

East Industrial WWTP MAINTENANCE

📍 Pasadena, TX

Capacity: 8.0 MGD

Flow: 6.5 MGD

Efficiency: 89.7%

Load: 81%

West Community Plant ONLINE

📍 Katy, TX

Capacity: 2.0 MGD

Flow: 1.6 MGD

Efficiency: 96.2%

Load: 80%

⏰ Detention Time (General)

Tank Volume (gallons)

Flow Rate (GPM)

Detention Time	-	minutes
Detention Time	-	hours

👥 Population Equivalent

BOD Load (lb/day)

Flow (MGD)

PE (BOD basis)	-	people
PE (Flow basis)	-	people
GPD per capita	-	gpd/person

📅 Sludge Age (Simple)

Aeration Tank MLSS (lb)

WAS Rate (lb/day)

Sludge Age	-	days
Status	-

📉 Percent Removal (Universal)

Influent Concentration

Effluent Concentration

Amount Removed	-	units
Percent Removal	-	%

🔄 Flow Unit Converter

Flow Value

Input Unit

MGD	-
GPM	-
GPD	-
CFS	-
m³/day	-
L/s	-

🔊 Blower Noise Estimation

Blower HP

Distance (ft)

Number of Blowers

Est. Sound Level	-	dB(A)
Status	-

🌍 Carbon Footprint Estimator

Energy Use (kWh/day)

Chemical Use (lb/day)

Biogas Captured (cf/day)

Energy CO2	-	lb CO2/day
Chemical CO2	-	lb CO2/day
Biogas Offset	-	lb CO2/day
Net Carbon	-	lb CO2/day

💰 Treatment Cost Analysis

Daily Flow (MGD)

Energy Cost ($/day)

Chemical Cost ($/day)

Labor Cost ($/day)

Sludge Disposal ($/day)

Total Daily Cost	-	$/day
Cost per MG	-	$/MG
Cost per 1000 gal	-	$/1000 gal
Monthly Cost	-	$/month
Annual Cost	-	$/year

📈 Fleet Analytics Summary

93.1%

Fleet Avg Efficiency

↑ 2.3% vs last month

82%

Avg Capacity Utilization

Optimal Range

$45.2K

Monthly Operating Cost

↓ 5% vs budget

99.2%

Compliance Rate

All permits current

💡 Tips: Click on a plant card to select it, then use Edit/Delete buttons. Use Compare to analyze multiple plants side-by-side. Export data to CSV for reporting.

🔀 Interactive Troubleshooting Wizard 9 PROBLEM CATEGORIES

Step-by-step diagnostic decision trees with visual path tracking

⚠️ Select Problem Category

📋 Recent Troubleshooting History

No troubleshooting history yet. Complete a diagnosis to save it here.

🔮 Process Simulations 20 SCENARIOS

"What happens if..." - Predict process changes before you make them

⚡ Quick Scenarios

🛠️ Custom Simulation Builder

📊 CURRENT CONDITIONS

Flow (MGD)

MLSS (mg/L)

DO (mg/L)

Temperature (°C)

SRT (days)

RAS Rate (%)

Influent BOD (mg/L)

🔄 PROPOSED CHANGES

New Flow (MGD)

New MLSS (mg/L)

New DO (mg/L)

New Temperature (°C)

New SRT (days)

New RAS Rate (%)

New pH

New Influent BOD (mg/L)

📜 Recent Simulations

No simulations run yet. Select a scenario above to begin.

📜 Texas TCEQ Certification Prep CLASS D-C-B-A

Practice tests for Texas Wastewater Operator Certification Exams

🌱 ENTRY

Class D

Entry Level Operator

• Basic plant operations

• Safety fundamentals

• Simple calculations

No tests taken yet

📘 INTERMEDIATE

Class C

Intermediate Operator

• Process control basics

• Lab procedures

• Intermediate math

No tests taken yet

📙 ADVANCED

Class B

Advanced Operator

• Supervisor responsibilities

• Advanced process control

• Complex calculations

No tests taken yet

👑 EXPERT

Class A

Chief Operator

• Full plant management

• Regulatory compliance

• All calculations

No tests taken yet

📚 Study by Topic

📜 Test History

No tests taken yet. Start a practice exam to track your progress!

📁

Document Center

SOPs, Permits, P&IDs, and Plant Documentation

SOPs

Permits

P&IDs

📋 Standard Operating Procedures

📋

No SOPs added yet

Click "+ Add SOP" to create your first procedure

📜 Permits & Regulatory Documents

📜

No permits added yet

Click "+ Add Permit" to store permit documents

🔧 P&IDs & Plant Drawings

Store and view Process & Instrumentation Diagrams, plant layouts, and equipment drawings.

🔧

No P&IDs added yet

Click "+ Add Drawing" to upload plant drawings

📂 Other Documents

Miscellaneous plant documents, manuals, reports, and reference materials.

📂

No documents added yet

Click "+ Add Document" to store reference materials

🎓

Training & Safety Center

OSHA-compliant safety procedures + 70+ curated training videos

Safety Topics

70+

Videos

OSHA

Compliant

⚡ Quick Navigation - Safety

🔒

LOTO

🚧

Confined Space

☠️

H₂S Awareness

🦺

PPE Guide

🚨

Emergency

⚗️

HazCom

⚡

Electrical

✅

Checklists

🔒 Lockout/Tagout (LOTO) Procedures OSHA 29 CFR 1910.147

⚠️ Purpose of LOTO

Lockout/Tagout procedures prevent the unexpected startup or release of stored energy during maintenance and servicing activities. At WWTPs, this includes pumps, blowers, mixers, clarifier drives, conveyors, and all electrical equipment.

📋 Standard LOTO Procedure - 8 Steps

Preparation

Identify all energy sources. Review equipment-specific LOTO procedures.

Notification

Notify all affected employees that equipment will be locked out.

Equipment Shutdown

Shut down equipment using normal operating controls.

Isolation

Isolate equipment from ALL energy sources.

Apply LOTO Devices

Apply your personal lock and tag to each energy isolation point.

Release Stored Energy

Bleed air/hydraulic lines, discharge capacitors, release spring tension.

Verification

Verify isolation by attempting to start equipment. Confirm zero energy state.

Perform Work

Equipment is now safe. Keep LOTO in place until ALL work is complete.

🏭 Common WWTP Equipment LOTO Points

💧 Pumps

• Electrical disconnect (MCC or local)
• Suction/discharge valves
• VFD isolation if equipped

🌀 Blowers/Aerators

• Main electrical disconnect
• Inlet/outlet dampers
• Bleed air pressure

⚙️ Mixers/Flocculators

• Motor disconnect
• VFD isolation
• Impeller blocking

🔄 Clarifier Drives

• Main drive motor disconnect
• Rake mechanism blocking
• Skimmer drive isolation

☠️ Hydrogen Sulfide (H₂S) Awareness EXTREMELY HAZARDOUS

☠️ ⚠️ ☠️

H₂S IS THE #1 KILLER IN WASTEWATER

Colorless gas - "rotten egg" odor at low levels
OLFACTORY FATIGUE above 100 ppm - you can't smell it!

📊 H₂S Exposure Levels

Level	Effects	Action
0.01-0.3 ppm	Odor threshold	Be aware
10 ppm	OSHA PEL, eye irritation	Exit, ventilate
50-100 ppm	Severe damage, loss of smell	Emergency! SCBA required
100 ppm	IDLH - Can't smell it!	Life-threatening
700+ ppm	Immediate death	Single breath fatal

🏭 H₂S Sources at WWTPs

🕳️ Collection

Manholes, wet wells, lift stations

📥 Headworks

Screening, grit removal areas

🔄 Primary

Clarifier scum troughs, sludge wells

🧪 Sludge

Digesters, belt press, truck loading

🦺 Personal Protective Equipment (PPE)

📋 PPE by Task

Task	👷	👓	👂	😷	🧤	👢
General Plant	✅	✅	-	-	-	✅
Blower Room	✅	✅	✅	-	-	✅
Chemical Feed	✅	Goggles	-	APR	Chem	✅
Chlorine Room	✅	Full	-	SCBA	Chem	✅
Confined Space	✅	✅	-	SCBA	✅	✅

👷

Head

Type I/II, Class E (electrical rated)

👓

Eye/Face

ANSI Z87.1, side shields

🧤

Hands

Match glove to hazard type

😷

Respiratory

Fit testing required

🚨 Emergency Response

📞 EMERGENCY CONTACTS

Emergency

911

Poison Control

1-800-222-1222

CHEMTREC

1-800-424-9300

🔥

FIRE

Activate fire alarm
Call 911
Evacuate via nearest exit
Meet at assembly point
Do NOT re-enter

☠️

CHEMICAL SPILL

Evacuate upwind
Alert others
Identify chemical (SDS)
Don appropriate PPE
Contain if trained

🏥

MEDICAL

Ensure scene is safe
Call 911
Provide first aid if trained
Get AED if cardiac
Stay with victim

⚠️ CONFINED SPACE RESCUE

NEVER enter without SCBA and retrieval equipment! Most fatalities are would-be rescuers. Call for help, use retrieval system from outside, wait for trained rescue team.

⚗️ Hazard Communication (HazCom) OSHA 29 CFR 1910.1200

🏷️ GHS Hazard Pictograms

💥

Explosive

🔥

Flammable

🧪

Corrosive

☠️

Toxic

⚠️

Irritant

🫁

Health Hazard

📄 SDS - 16 Required Sections

1. Identification

9. Physical/chemical properties

2. Hazard(s) identification

10. Stability and reactivity

3. Composition/ingredients

11. Toxicological info

4. First-aid measures

12. Ecological info

5. Fire-fighting measures

13. Disposal considerations

6. Accidental release

14. Transport info

7. Handling and storage

15. Regulatory info

8. Exposure controls/PPE

16. Other information

⚡ Electrical Safety NFPA 70E

⚡⚠️⚡

ARC FLASH HAZARD

Up to 35,000°F - Always verify de-energized state and wear appropriate PPE

📋 Electrical Safety Rules

1.Only qualified persons work on electrical

2.Assume all circuits energized until proven otherwise

3.Apply LOTO before any electrical work

4.Maintain safe approach distances

5.Wear appropriate arc-rated PPE

6.Never work alone on energized equipment

🦺 Arc Flash PPE Categories

Cat 1

4 cal/cm²

Cat 2

8 cal/cm²

Cat 3

25 cal/cm²

Cat 4

40 cal/cm²

📊 Executive

⚙️ Operations (Hydraulic Flow Order)

💼 Business

📚 Quick Reference Library

🧫 MLSS (Mixed Liquor Suspended Solids)

Process Type	Typical Range	Optimal
Conventional Activated Sludge	1,500 - 3,500 mg/L	2,000 - 3,000 mg/L
Extended Aeration	3,000 - 6,000 mg/L	4,000 - 5,000 mg/L
MBR Systems	8,000 - 15,000 mg/L	10,000 - 12,000 mg/L
SBR Systems	2,000 - 5,000 mg/L	3,000 - 4,000 mg/L
MBBR Systems	2,000 - 4,000 mg/L	2,500 - 3,500 mg/L

⏱️ SRT (Sludge Retention Time)

Treatment Goal	Typical SRT	Notes
BOD Removal Only	3 - 5 days	Minimum for stable operation
Nitrification	8 - 15 days	Temperature dependent
Extended Aeration	20 - 30 days	Low sludge production
Cold Weather (<15°C)	15 - 25 days	Slower nitrifier growth
Warm Weather (>20°C)	8 - 12 days	Faster kinetics

⚖️ F/M Ratio (Food to Microorganism)

Process Type	F/M Range	Optimal
Conventional	0.2 - 0.5	0.3 - 0.4
Extended Aeration	0.05 - 0.15	0.08 - 0.12
High Rate	0.5 - 1.0	0.6 - 0.8
Contact Stabilization	0.2 - 0.6	0.3 - 0.5

📉 SVI (Sludge Volume Index)

SVI Range	Condition	Action
< 100 mL/g	Excellent settling	Optimal operation
100 - 150 mL/g	Good settling	Monitor closely
150 - 200 mL/g	Fair settling	Investigate causes
> 200 mL/g	Bulking sludge	Immediate action needed

💨 Dissolved Oxygen (DO)

Location/Process	Target DO	Notes
Aeration Basin	1.5 - 2.5 mg/L	Minimum 1.0 for nitrification
Anoxic Zone	< 0.5 mg/L	Required for denitrification
Anaerobic Zone	< 0.2 mg/L	Bio-P removal
Final Effluent	> 4.0 mg/L	Permit requirement typical

🧪 pH & Alkalinity

Parameter	Optimal Range	Critical Limits
Aeration Basin pH	6.8 - 7.5	< 6.5 or > 8.5 inhibits nitrification
Alkalinity (as CaCO₃)	100 - 200 mg/L	< 50 mg/L causes pH crash
Alkalinity for Nitrification	7.1 mg/L per mg NH₃-N	Consumed during nitrification

🚨 Bulking Sludge (High SVI)

Symptoms: SVI > 150, poor settling, rising sludge blanket

Low DO: Increase aeration, check diffusers
Low F/M: Reduce MLSS, increase wasting
Nutrient deficiency: Check N:P ratio (100:5:1 BOD:N:P)
Septicity: Check collection system, reduce detention time
Low pH: Add alkalinity (lime, soda ash)

🫧 Foaming Problems

Brown/Tan Foam (Nocardia):

Reduce SRT to 8-10 days
Increase wasting rate
Add chlorine to RAS (2-5 mg/L)
Spray water to break foam

White Foam:

Young sludge - reduce wasting
Low MLSS - reduce wasting, increase SRT
Surfactants - check industrial inputs

⚠️ Poor Nitrification

Symptoms: High effluent ammonia, low nitrate

Low DO: Maintain > 2.0 mg/L in aeration
Low SRT: Increase to 12-15 days minimum
Low pH: Maintain pH > 6.8, add alkalinity
Cold temperature: Increase SRT in winter
Toxicity: Check for industrial discharge
Insufficient alkalinity: Need 7.1 mg/L alk per mg/L NH₃-N

🔄 Rising Sludge in Clarifier

Symptoms: Clumps of sludge floating, gas bubbles

Denitrification: Reduce sludge blanket depth
Increase RAS rate
Reduce SRT if over-nitrifying
Add anoxic zone before clarifier
Check for septic conditions

🔬 Pin Floc / Dispersed Growth

Symptoms: Turbid effluent, small floc particles

Over-aeration: Reduce DO to 2.0 mg/L
Toxicity: Check industrial inputs
Low SRT: Increase SRT, reduce wasting
Hydraulic washout: Check for I&I during storms
Add polymer to clarifier

🧫 High Effluent Phosphorus

Symptoms: Effluent TP > permit limit

Chemical addition: Alum, ferric, or ferrous
Dose ratio: 1.5-2.5 mol Fe/mol P or 1.5-2.0 mol Al/mol P
Bio-P issues: Check anaerobic zone DO (< 0.2 mg/L)
Ensure VFAs available in anaerobic zone
Check for nitrate recycle to anaerobic zone

📋 TCEQ Typical Effluent Limits

Parameter	Daily Avg	Daily Max	Units
BOD₅	10 - 20	25 - 40	mg/L
TSS	15 - 20	30 - 45	mg/L
Ammonia-N (Summer)	2 - 5	4 - 10	mg/L
Ammonia-N (Winter)	3 - 10	6 - 20	mg/L
Total Phosphorus	0.5 - 1.0	1.0 - 2.0	mg/L
E. coli	126	399	CFU/100mL
DO (Minimum)	4.0 - 6.0	-	mg/L
pH	6.0 - 9.0		S.U.

📊 CBOD₅ vs BOD₅

Parameter	When Required	Typical Limit
BOD₅ (Total)	Standard permits	20 mg/L avg, 40 mg/L max
CBOD₅	Nitrifying plants	10 mg/L avg, 25 mg/L max
Note:	CBOD ≈ 0.8-0.9 × BOD for nitrifying plants

📅 Typical Monitoring Frequency

Parameter	Small (<1 MGD)	Medium (1-5 MGD)	Large (>5 MGD)
Flow	Daily	Continuous	Continuous
pH, DO, Temp	Daily	Daily	Continuous
BOD, TSS	Weekly	2x/week	Daily
Ammonia	Weekly	2x/week	Daily
E. coli	Weekly	2x/week	Daily
Phosphorus	Monthly	Weekly	2x/week

🧮 Common Formulas

Parameter	Formula
F/M Ratio	F/M = (Q × BOD × 8.34) / (V × MLSS × 8.34) = Q × BOD / (V × MLSS)
SRT (days)	SRT = (V × MLSS) / [(Qw × MLSS_ras) + (Qe × TSS_eff)]
MLSS (mg/L)	MLSS = (SRT × Q × BOD × Y) / [V × (1 + kd × SRT)]
OLR	OLR = (Q × BOD × 8.34) / (V × 1000) lb BOD/1000 cf/day
SVI (mL/g)	SVI = (Settled Volume mL/L × 1000) / MLSS mg/L
WAS Flow	Qw = V / SRT - Qe × (TSS_eff / MLSS_ras)
RAS Rate	RAS% = MLSS / (MLSS_ras - MLSS) × 100
Detention Time	DT (hr) = V (gal) × 24 / Q (GPD)
Surface Loading	SLR = Q (GPD) / Area (sf)
Weir Loading	WLR = Q (GPD) / Weir Length (ft)

📐 Conversion Factors

Convert From	To	Multiply By
MGD	GPM	694.4
MGD	m³/day	3,785
lb/day	kg/day	0.4536
mg/L × MGD × 8.34	lb/day	-
ft	m	0.3048
sf	m²	0.0929
cf	gal	7.48
psi	ft head	2.31
HP	kW	0.746

📊 Typical Design Constants

Parameter	Symbol	Typical Value
Yield Coefficient	Y	0.4 - 0.6 lb VSS/lb BOD
Decay Coefficient	kd	0.05 - 0.1 day⁻¹
MLVSS/MLSS Ratio	-	0.70 - 0.85
BOD:N:P Ratio	-	100:5:1
O₂ for Carbonaceous	-	1.1 - 1.5 lb O₂/lb BOD
O₂ for Nitrification	-	4.6 lb O₂/lb NH₃-N
Alkalinity for Nitrif.	-	7.1 mg/L alk per mg/L NH₃-N

Quick reference SOPs for common wastewater operations. Click any card to view the full procedure.

🚀 Plant Startup

Procedures for starting treatment processes after shutdown

🛑 Emergency Shutdown

Emergency procedures for plant shutdown

🔄 Sludge Wasting

WAS calculation and wasting procedures

⚙️ Clarifier Operations

Primary and secondary clarifier operation

☢️ Disinfection

Chlorination and UV disinfection procedures

🧪 Sampling & Testing

Sample collection and lab testing procedures

⚗️ Chemical Handling

Safe chemical storage and handling

💨 Blower Operations

Aeration blower startup and maintenance

🗜️ Dewatering

Belt press and centrifuge operation

📊 DASHBOARD

🔄 REACTORS

🔄 Advanced Reactor Systems

🔄 SBR Master Parameters

🔬 MBR Master Parameters

🧫 MBBR Master Parameters

🔄 Sequencing Batch Reactor (SBR) Analysis ?

🔬 Membrane Bioreactor (MBR) Analysis ?

🧫 Moving Bed Biofilm Reactor (MBBR) Analysis ?

📋 COMPLIANCE & LAB

📋 TCEQ Compliance & Laboratory Module

Daily Monitoring Data Entry

DMR Due

Permit Expires

Days Compliant

Violations YTD

Upcoming Deadlines

Duplicates

Blanks

Standards

Hold Times

🏭 PLANT PROFILES

💼 BUSINESS

💼 Business & Consulting Tools

📊 Scenarios

💰 Best ROI

📈 Highest NPV

🎯 Selected

Capacity Expansion

Energy Optimization

Enhanced Nutrient Removal

SCADA & Automation

Biosolids Enhancement

Climate Resilience

📊 Combined Scenario Analysis

🛠️ Custom Scenario Builder CREATE YOUR OWN

📋 Project Details

💰 Financial Analysis

No Custom Scenarios Yet

💰 Operations Cost Calculator

Daily Cost

Monthly Cost

Annual Cost

Cost per MG

👥 Client & Project Management

Total Clients

Active Projects

Plants Managed

Revenue YTD

📝 Proposal Generator

💵 ROI Calculator

📍 Current State

🎯 After Improvements

⏱️ Time Tracking

Total Hours

Billable Hours

Unbilled Amount

Avg Hours/Day

🤖 AI Enhancement

🧠 Intelligent Process Analysis AI Powered

📊 Google Sheets Sync

📤 Export Data to Sheet

📊 Daily Operations

🧪 Lab Results

💰 Costs

🔄 Auto-Sync Settings

📋 Service Proposal Generator

👤 Client Information

🏭 Facility Information

🛠️ Services Offered

📋 Routine Services

📊 Reports & Compliance

🔧 Special Projects

💰 Pricing

📅 DAILY OPERATIONS

🌅 Morning Checks (6:00 AM)

☀️ Midday Checks (12:00 PM)

🌙 Evening Checks (6:00 PM)

⚖️ F/M Ratio Wizard

⏱️ SRT Wizard

🔄 Sequencing Batch Reactor (SBR) Analysis

🔬 Membrane Bioreactor (MBR) Analysis

🧫 Moving Bed Biofilm Reactor (MBBR) Analysis